Kyle Walker says the sky is the limit for Manchester City teammate Raheem Sterling.
The England winger was instrumental in City claiming their second consecutive Premier League title last season, contributing 25 goals and making 15 assists.
City boss Pep Guardiola has worked with many top players, including Lionel Messi, and Walker thinks there are no reason Sterling can't elevate himself to that level.
"If he keeps listening and getting advice from the gaffer and takes it on board, the sky is the limit," said Walker.
"The manager has worked with the best in (Lionel) Messi."
On Sterling's character, Walked added: "I can assure you, there a lot of players who have done a lot worse than Raheem and nothing has been said about them.
"He deserves full credit to come out the other end and stay true to himself. It shows his character."