Dan Petrescu, coach of the Qatar Stars League outfit, told Digi Sport on Tuesday that the 34-year-old playmaker had signed a pre-contract agreement with the club.
The Spain midfielder – currently playing at the FIFA World Cup – has regularly been linked with a move away from Camp Nou in recent times.
Xavi's declining form was a symptom of Barca's poor season, which saw them end the campaign without a major trophy for the first time since 2007-08.
And Fabregas, who this month moved to Chelsea from Barcelona, told Marca: (Xavi) and (Carles) Puyol have decided to step aside.
"(They want) to be closer to their families, away from so much demand."
Puyol ended his 17-year playing career with Barcelona when he retired last season.
‘He instantly popped into our ratings as one of the best U21 midfielders in Europe. The impressive thing is Slot has made him into more of a no.6' Inside Ryan Gravenberch's transformation at Liverpool
‘I don’t think Liverpool would look at Ollie Watkins, a striker isn’t a pressing issue for them – it’s Arsenal who need one’ Former Reds star explains why his old club don’t need an out-and-out forward this summer
