The Spaniard had a difficult task on his hands.
The former midfielder says Manchester United's struggles are a warning to Arsenal.
These midfield duos were a joy to watch over the Premier League years.
The former forward left his coaching role with the Gunners this summer.
Sunderland won against Chelsea in the Premier League on Saturday.
The Chelsea star says Gilberto Silva and Mathieu Flamini rank above the likes of Andres Iniesta and Patrick Vieira in his eyes.
The Arsenal legend is surprised by the 23-year-old's transition to English football.
The former Gunners star says that despite blowing their chance to win the title, fans should not be too critical of the long-serving manager.
The Gunners take on the league leaders at the Emirates on Sunday in a huge title clash.
The French midfielder is a key star in Arsene Wenger's side.