He told BeIN Sport: "Steven is one of the top midfielders in the world and if he won the Premier League then he is the best in the world.
"He has waited a lot of years to win the title. He has won the Champions League, which is more difficult than winning the title, and now he knows that it's a really good time for him.
"His performances this season have been brilliant. He knows to keep his head down because we have four more difficult games, but I think he is the best man in the world.