New Wolves boss Stale Solbakken is delighted to have brought the former Chelsea youngster on board, with the club readying themselves for a promotion push in the Championship.
"Frank is a player that our scouts have been watching," he told the club's official website.
"We think he has qualities that we can develop, and with his physical strength and power I feel that he can help us.
"He should be a useful acquisition to the squad and it is a good opportunity for him to come to a stable club and work hard.
"I think there is a win-win situation for both the club and the player. He is a young guy and he can add to his potential every week."