Vilanova had to leave the post after suffering a relapse in his battle against throat cancer.
Iniesta told AS: “Tito will once again win this terrible battle facing him. On behalf of the players and everyone, I send him all my love and support. At the end of the day, this is about a person, not a coach.”
Meanwhile Messi took to Facebook to issue a simple statement, saying: “Strength Tito! We are all with you in this fight!”