"Jason McAteer faces the possibility of another operation which is going to keep him out for a further six to eight weeks," Wilkinson said.
"He has got an abdominal hernia as opposed to the one in the groin.
"It's a very, very uncommon injury for a footballer, more common in rugby players, and there has been a complication to it which on second opinion may require surgery.
"But we don't know exactly at the moment until we have looked at other things and we will see how it pans out."