After establishing himself in Lambert's team during the manager's first campaign, he has been the most consistent performer this season.
"When I originally came back from injury I wasn't training every day and for someone like me I think I have to," he explained.
"When Paul Lambert came I thought I would have been training twice a week. But he was like 'no chance - you're training every day'.
"I feel a lot stronger, a lot more confident in my physical shape."
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