Villa boss Lambert insists he hasn't forgotten Helenius
He is yet to start in the top flight after a £2m summer move from Aalborg.
"Once he gets that opportunity, he has to take it," Lambert said.
"Someone has to miss out, but there will be a contribution for him.
"He's been fine, Nicklas. I don't have a problem with him at all, I can only pick 18 lads to get the result."