Gyepes is back in action after a period out with a knee injury

The 26-year-old Hungary international played 24 games for Wolves after moving to Molineux from Ferencvaros for �1m.

His contract was terminated by mutual consent when he suffered a knee injury and returned to his homeland to continue his rehabilitation.

"I know all about Gabor's quality from working with him at Wolves," Gray told the club website.

"He's a big and powerful central defender who's a very good age. He was doing really well at Wolves until he got injured."