The 30-year-old struggled last season but Foster feels the former Werder Bremen man is primed for a good campaign.
"We're so lucky, Markus has been fantastic," said the Albion goalkeeper.
"All he needed was a bit of a run because we get to see him in training every day and he's up there with the best finishers I've seen.
"He just puts the ball in the net. If he can transfer that on to a match day we've got an absolute world beater because he just has a knack of finding the corners.
"We've got a lot of options for the gaffer to mull over and decide what he's going to do."
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