The former Lyon captain made the move to Betis this past summer.
Joaquin says: "Good footballer, very good.
"I don't know him yet, but he looks good people. Fekir can be a very good footballer, very interesting this year, hopefully he will give us many joys."
He added: "Almost all of us who like football are looking forward to seeing him play because he is a different footballer. He's one of the players that make a difference."