The midfielder's injury-free start to the campaign is a big boost for Villa and potentially England.
Lambert said: "He's training more days than he did before we came in, consistency and confidence, it's probably a mixture of everything.
"He's playing ever so well at the minute, there's no two ways about it, but I have nothing but praise for the whole team after the three games we've come through.
"He's only a young lad still, if he can keep injury free then he's got a big, big future."
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