Xavi claims he can understand why Dele Alli is being compared to Paul Gascoigne.
The former Barca midfielder could be forgiven for trying to sell Coutinho on a move to the Nou Camp, but he has done quite the opposite.
The likes of Victor Wanyama, Virgil van Dijk and Fraser Forster have left Celtic in recent years.
Celtic are playing in the Champions League this season.
The Dutchman took charge at Everton in the summer.
Everton have enjoyed a strong start to the season under Koeman.
Former Barcelona star Xavi speaks highly of Celtic fans.
Henrik Larsson joined Barcelona in the summer of 2004 after leaving Celtic.
Celtic are currently in third place in their Champions League group.
Leicester City's Riyad Mahrez signed a new contract with the club this summer, and Xavi thinks he is good enough to play for Barcelona.
Xavi recently said that he would have chosen to play for either Manchester United or Liverpool in the Premier League.
Former Liverpool defender Jamie Carragher has praised Barcelona stalwart Xavi ahead of the Champions League final.
Barcelona star Xavi has agreed to join Qatari side Al Sadd this summer.