Hamdaoui has been troubled with the injury since the 1-1 draw away at Leicester City on February 14th. The striker has been in his native Holland to try and get the injury repaired but has returned to England still in some distress.
The groin operation will see him out of action for at least two months by which time season and the players loan spell will be over.
This is the second time Hamdaoui has been injured whilst with the Rams. His first loan spell ending with a damaged shoulder earlier in the season.
Derby County are now left again with a striker shortage as yesterday Paul Peschisolido pulled up in training with a hamstring problem. The Rams now have only Charlton loan player, Kevin Lisbie as their only recognised first team striker.
The striker problem does not help care-taker manager Terry Westley in today’s trip to high flying Watford, who are currently third in the Championship table and are eager to try and pull in the seven pint gap between themselves and Sheffield United for the second place spot and automatic promotion to the Premiership.