The midfielder scored in City's Champions League win at Club Brugge this week.
Walker said, : He has shown glimpses of what he can do during training. He has impressed us all and is an exciting talent, but he must have his feet on the ground.
"It is a step in the right direction for him and he should enjoy it.
"At the same time, it is a new training session tomorrow and then he must continue to work hard and make sure he is in the squad for the weekend."
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