Atletico Madrid boss Diego Simeone believes Antoine Griezmann has the potential to become one of the best players in the world.
The France international has been in fine form for the start of the season, scoring the winner in their opening-day win over Las Palmas, while he was instrumental in their win over Sevilla.
His form carries over from last season, when he scored 25 goals and assisted a further six, and Simeone believes he can be one of the world's elite players.
"He always challenges himself, which is very important in the life of any person, whenever one puts that one themselves they have to work to get a result," he said ahead of Atletico's clash with Barcelona on Saturday.
"Antoine has grown tremendously. He's a young guy with great enthusiasm, eager to make progress and have a lot of things athletically speaking to be in the best level of all.
"Hopefully the result of work and regularity of game gives you the chance to be in such an important place as he looks. He has the natural ability to get to the top, of that I am not doubtful."