The youngster was finally handed his full Premier League debut in the 3-0 win over Brighton in midweek, but has no guarantee of starting against West Ham in Monday's London derby.
“I think [a] very good player. He's just starting his career," Pellegrini said. "I always say about those young players starting that it's not so difficult to arrive, a lot of good players with technical conditions arrive to play in the first team.
"But after that you must keep it. At the beginning any little good thing a young player does, people will say how good they are. But after that they will demand more.
“The second step for a young player will demonstrate the divide, which will be top players and which will not.
“I think that he has all the condition to be a top player. So it will depend on the mentality and ambition where he can arrive."
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