French-born Malian international, Tongo Doumbia joined Wolves in the summer of 2012 from French club Rennes.
The midfielder, who initially joined on loan, signed a permanent deal with the club in November 2012 after impressing in his opening months at Molineux.
His first goal for the club came against Ipswich Town at Portman Road, which was followed by a spectacular strike which opened his Molineux account at home to Brighton.
Prior to joining Rennes, Doumbia had played for LB Chateauroux in the French Second Division.
He was in the frame of making the Malian squad for the 2013 African Cup of Nations but injury put paid to his inclusion having been named in the provisional squad.