Antonio Nunez will undergo exploratory keyhole surgery today after suffering a setback in his bid to recover from a knee injury.
The Spanish star partially tore the medial ligament in his left knee in only his second training session with the Reds last month and was initially told he'd be out of action for four weeks.
But the former Real Madrid winger suffered a setback in his rehabilitation ten days ago and, with the injury showing no signs of settling down, the Reds have decided on keyhole surgery to get to the root of the problem.
"We'll have a much better idea how long Antonio will be out for when he has had exploratory keyhole surgery later today," said club spokesman Ian Cotton.