Manchester United have signed a "superstar" in Alexis Sanchez, according to Ryan Giggs.
The Chilean was confirmed as a United player on Monday night with Henrikh Mkhitaryan heading to Arsenal as part of the deal.
Giggs was part of the squad that welcomed Robin van Persie to the club from Arsenal in 2012. The Dutchman won the title in his first season and Giggs believes Sanchez could have the same impact.
"Manchester United signing Alexis Sanchez is similar to Robin van Persie in the sense that they're getting a ready-made superstar," he told Sky Sports. "You're seeing the contribution already with Anthony Martial upping his performances.
"That can happen when top players come in, those around them lift their levels, and there will be some difficult selection decisions for Jose Mourinho."
United fans will get their first chance to see Sanchez wearing his new No. 7 shirt against League Two Yeovil in the FA Cup on Friday. The game at Huish Park will also be an opportunity to find out where Jose Mourinho sees the 29-year-old fitting into his team.
"Sanchez can play on the right, as he did at Barcelona, so if Martial is flying then he may have to play in a different position, but those sort of decisions are positive for a manager to have to make," Giggs added. "It is an extra bonus that he can play in the Champions League.
"To have somebody like that, who won't be fazed by playing in the big games, makes the squad look really strong.
"The defence is obviously doing really well as well, with Ashley Young back, Luke Shaw fit and Chris Smalling and Phil Jones really solid, so I don't think they need to do any more business this month."