Griezmann scored in victory over Celta Vigo on Sunday.
"All I've asked of him is that whilst he is with us, he gives everything, as he is doing," said Gabi.
"Antoine is a special boy to everyone related to this club, he's loved in the dressing room.
"He puts the team on another level and he's one of the few in this team who can make a difference."
Defeat to the Blaugrana at the Camp Nou has made winning the title unlikely for the Madrid club, the maths of the table doesn't lie on that front, however the veteran midfielder refuses to give up.
"We know it's very difficult, but we're not going to simply hold up our hands," he confirmed.
"We want to have a chance of winning the title right until the very end.
"The only way to do this is to not give up any points, last Sunday's result forces us to win every single match."