Alexis Sanchez made a mistake when he left Arsenal to join Premier League rivals Manchester United, according to Robert Pires.
The Chile star spent four years at the Emirates, scoring 80 goals in 166 appearances for the Gunners and helping the club win two FA Cups.
But he completed a controversial move to Old Trafford last January in a deal that saw Henrikh Mkhitaryan head in the opposite direction.
Much was expected of Sanchez following his arrival at United but the 29-year-old has endured a difficult period, netting just four goals in 26 games.
The Chilean has lost his place in Jose Mourinho’s starting line-up and Pires says he should have stayed at Arsenal.
“Honestly, it surprised me,’ Pires told Chilean newspaper El Mercurio when asked about Sanchez’s departure from the Emirates.
‘For me, Sanchez had to stay at Arsenal, where he was one of our stars.