The manager was full of praise for his returning high-earners as they starred in a 3-1 win over Mansfield.
"I've always known they have been good players," said Lambert. "Everybody knows the situation that was going on with the football club.
"But these lads have been brilliant.
"Darren has worked ever so hard and Alan is the same.
"Charles has come back from a year out, too, so there are some major positives from the game."
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