Vilanova says Tello has a big role to play in the team's future.
"Tello is a special player, he gives us different things. He takes on his mark, he shoots and he's feeling more comfortable in the first team," said Vilanova.
"At the beginning of the season perhaps we didn't think that Tello would turn into the player he is today. Alexis played at a good level. He has grown in confidence and that's good for him and for us."