Arsenal hero Martin Keown says West Ham United midfielder Ravel Morrison faces a big test against Manchester City.
Keown wrote in the Daily Mail: "Ravel Morrison is a player everyone is talking about and his wonder goal against Tottenham will have sparked his confidence.
"But we have to be careful with young players - what works for one may not work for another. He has talent but needs to produce consistently.
"He has had problems with his temperament and we saw a flash of that when he clashed with Wilfried Zaha in the Under 21s this week. He has an edge but he needs to prove he can be trusted.
"On Saturday he faces Yaya Toure, who is arguably the best midfielder in the league.
"It will be his biggest test and might show where he currently is with his development, but clearly he's an exciting prospect."
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