"When he's on song he's as good as it gets," says Martinez. "His technical ability, his ball control, his vision for a pass is there to be seen.
"That sort of player has a genius streak. His performance against Aston Villa was very much of someone who wants to be involved in a team.
"He was the top piece of the pyramid in their good work going forward so we'll have to be well aware of the quality in making sure he doesn't effect the game in that way against us.
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