"The moment has come for Xavi to say goodbye," Joaquin Hernandez told radio Cope.
The deal suits Xavi as he is able to coach and play for Al Sadd.
"He is lucky to have received a really impressive offer that allows him to continue playing football, train as a future coach and also rest a little."
According to various media reports in March, Xavi met with Al Sadd but nothing was officially confirmed other that he had not yet signed for the club.
Xavi will personally announce the move during a press conference on Thursday, Spanish media reported.