Since his departure from Manchester United 12 years ago, Cristiano Ronaldo has yet to make his debut for the Red Devils, but he is expected to make his comeback on Saturday when Man Utd play Newcastle United in the Premier League. It will be his second home debut for the club, and many visitors will be tempted to splash out on a CR7 shirt.Cristiano Ronaldo's return to Manchester UnitedThe Portuguese superstar's return to Manchester has triggered huge interest from the fans. Shirt sales for the Manchester United team have surpassed any other record in the history of the sport outside the United States. The new shirt also boasts a picture of Ronaldo with his team mates. The shirt has also shattered the record for the fastest selling sports kit outside the United States.The sales figures are even higher than those of Lionel Messi's move to Paris Saint-Germain. Ronaldo's shirt has sparked a frenzied online buying spree. The shirt has sold almost twice as many Manchester United shirts as the former Barcelona star. A CR7 shirt is the most popular shirt in Manchester, and fans worldwide have rushed to buy one.The move to sign Ronaldo is highly unlikely to happen, but the rumoured return of the Real Madrid star has led to a massive jump in shirt sales for the Manchester United team. Shirt sales have increased by more than two-thirds in 10 days, and United's return to the Champions League has sparked a surge in interest from the Premier League.Since Messi's arrival, Ronaldo has made only one appearance for the 2020 Champions League finalists. The Manchester United shirt sales are expected to go through the roof next week when United and Paris Saint-Germain kick-off their Champions League campaigns. Both teams will travel to Young Boys and Club Bruges in the Champions League on Tuesday and Wednesday respectively. Despite the disappointing start to the season, Ronaldo's return to Old Trafford has boosted the club's shirts sales by 187m in ten days.His desire to leave the clubMan United have been able to sell a record number of Cristiano Ronaldo shirts in the first 10 days after the forward's return to Old Trafford. The Portuguese forward has been the main attraction at the club for the last few years, so his return was expected to increase sales. The Manchester club's fans also showed their appreciation by buying shirts of Ronaldo and celebrating his return to Old Trafford.According to reports in the media, Cristiano Ronaldo is now in England and is expected to hold talks with Manchester United boss Erik ten Hag. The Portuguese forward has not spoken to United boss Erik ten Hag since the transfer window closed last month. United have insisted that Ronaldo is not for sale and will remain part of the squad until 2022/23 season.After leaving Manchester United 12 years ago, Cristiano Ronaldo hasn't made a Premier League debut. However, the Portuguese international is expected to return to Old Trafford in a PL match against Newcastle United on Saturday. The match will most likely be played in front of a packed Old Trafford, which will likely lead to a CR7-induced rush in shirt sales.If Man United sell Cristiano Ronaldo to another club, they would be in a strong position to compete for top prize. A potential sale of Cristiano Ronaldo would require a massive jolt to the club's wage structure. However, they may be unwilling to part with him for a small fee in return. If they do sell him, it would mean a significant increase in the number of shirts they have sold in the first 10 days of his return.His relationship with manager Louis ten HagAs the Portuguese star prepares to meet his new manager, concerns are being raised about his relationship with the Dutchman. Managing a big-money club can be tricky and Ten Hag needs to make sure that he can command the respect of his players. Respect is much easier to earn if the manager stands behind his words. Unfortunately, with a player like Ronaldo in the dressing room, this seems unlikely.While it is understandable that the relationship between the Portuguese superstar and the new manager might not be ideal, it is essential that both sides can agree on what is best for the club. Ten Hag needs his players to sign up to his style and make runs in the game to help the team achieve their aims. However, it is important to understand that the Dutch manager doesn't want a fight with Ronaldo and wants to get the best out of his players. It is not clear whether he will be available to start the first game of the season against Brighton - which would create extra pressure and risk for the team.The Dutchman is planning to meet every player he has contracted, and is already organising one-on-one chats with all of them. Ten Hag said he is looking forward to talking to every player in the squad and developing their individual relationships. However, he is also addressing questions over whether Ronaldo is suited to the high-pressing style of the Dutchman. So, what is the key to the relationship between Ten Hag and Ronaldo?His desire to move to Atletico MadridDiego Simeone has been open to the possibility of signing Cristiano, believing that he will provide Atletico with the guaranteed goals that they desperately need. However, Simeone is also aware of the long history Cristiano has with Atletico's rivals Real Madrid. Cristiano is the all-time leading goalscorer at Real, and won four Champions League titles during his time with the Spanish giants. While Simeone has no hard feelings, many Atletico fans are sceptical about the idea of letting Cristiano wear the club's colours once he is past his prime.The 'Impressive' Ronaldo was reportedly impressed with Simeone's efforts to sign him. The Portuguese international has expressed his desire to move to Atletico Madrid after his disappointing time at Manchester United. Manchester United, however, have an obligation to sell Ronaldo and 40 million euros in players in order to get him. The 'Impress' Xavi's dreams' message will surely reach the heart of Ronaldo's adoring fans.While it is hard to say whether Cristiano Ronaldo will move to Atletico Madrid, the president of Atletico Madrid has commented on the speculation. It is unclear whether Ronaldo will leave Manchester United, but his desire to join rivals in the Champions League is growing. After all, the five-time Ballon d'Or winner does not have a particularly good bond with his Manchester United teammates.The transfer of Ronaldo is likely to be one of the biggest deals of the summer. After all, Chelsea have already lost Andreas Christensen and Antonio Rudiger, while Manchester City signed Raheem Sterling from Manchester City. Despite the rumors, Manchester United will have a hard time keeping Cristiano in London. Bayern, meanwhile, are looking for a replacement for Lewandowski, which may make things a little more difficult for Atletico.His relationship with Manchester CityThe future of Cristiano Ronaldo's relationship with Manchester is unclear. After a tumultuous year at Old Trafford, the Portuguese international has returned to Manchester United. In a shock move, Ronaldo agreed to a deal in the last hours of the transfer window. His move shocked Manchester City fans, and a rumour that he was about to join the Premier League club was quickly debunked.While most players would welcome a move away from the club, the relationship between Ronaldo and his former club has become strained. Rangnick has reportedly told Ronaldo to improve his clinical nature in front of goal. But it's not clear if the Portuguese star will leave Manchester United in the summer. A report in The Sun claims he is unhappy with the form of Manchester United's senior players.While it's possible that Ronaldo will remain at Inter Milan, his decision could be a huge blow to Juventus. If he moves to City, he may lose his legendary status. However, he has reportedly spoken to City manager Pep Guardiola. The deal is expected to be completed in the near future. While Manchester City and Juventus were rumoured to be chasing Ronaldo, he is now believed to be preferring City.It's important to note that while Manchester City is one of the most successful teams in history, they struggled in the early years. Despite the clamour of supporters, Ronaldo's team struggled to reach the Champions League. As a result, their poor performance has been attributed to their poor chemistry. The Portuguese international was criticized in an interview with the Guardian in which he acknowledged that he is constantly being booed because of his fame, wealth, and sex. During the same interview, TV 3 aired a cartoon on the booing of Ronaldo. The show also highlighted the relationship between Ronaldo and Manchester City's tycoon.