Arsenal great Robert Pires believes Alexis Sanchez made a big error in choosing to leave the club for Manchester United and ponders whether he will have to move to another club soonThe Chilean forward has managed just four goals and six assists in 26 appearances for United across all competitions since arriving from Arsenal in January.Manager Jose Mourinho hailed Sanchez’s signing at Old Trafford as a major coup back then, but the 29-year-old could be out of the club by the New Year.And Pires feels he knows exactly where Sanchez went wrong.“Alexis was very good, he’s an excellent footballer, but I also got to know him as a person and I can say that I loved knowing him, he is a friend,” Pires told El Mercurio.“He stands out for his professionalism and that helped Arsenal to win several titles.“Honestly, it surprised me. For me, Sanchez had to stay at Arsenal, where he was one of our stars.“I don’t know if he could say no to United, but I think the style of play of the London club suits his performances better. But you have to respect his decision.”Alexis Sanchez 2014/15 was something else pic.twitter.com/Xv4OdsOwzDMaguire says United need to build on today’s win George Patchias – September 14, 2019 Harry Maguire wants his United teammates to build on the victory over Leicester City.During the summer, Harry Maguire was referred to as the ultimate…— Rk (@RkFutbol) October 16, 2018The former France international did, however, suggest that Sanchez would have benefited working under Pep Guardiola at Manchester City rather than Mourinho.“Yes, he’s going through a complex moment. The relationship with the manager is always important, but it’s notable that there are complications between Jose Mourinho and him,” added Pires.“When you’re a United manager and you have players like Paul Pogba and Sanchez, you have to take care of them, because in the end the only important thing is for the team to win.“When there are problems, the most important and complicated thing, at the same time, is to sit down to talk and say things face to face.“Sanchez doesn’t deserve to be on the bench or stay at home. We’ll see if he finds a solution in January, because he is not playing and he has to do it, since he is a wonderful footballer.“Mourinho and Josep Guardiola are two coaches who know how to win and conquer titles, but now, City’s way of playing is higher than United’s and it could be that if Alexis went to Pep’s team his situation would be different.”Liverpool legend Jamie Carragher even suggested Sanchez has become the new Fernando Torres of Chelsea.