Northampton and England prop Alex Corbisiero is to have another knee operation next week after suffering an injury setback.
Saints boss Jim Mallinder revealed that Corbisiero will go under the knife on Tuesday.
"He will unfortunately have to go in for another operation on Tuesday," he told Press Association Sport.
"He will be out for a few more weeks.
"It is just a bit of a clean-out, so it is not major. He has got a bit of a niggle going on in there.
"It is not good for him, but he is being positive and we are being positive about it. The surgeon is confident he can sort him out.
"I think the Six Nations is a very long way off for him. He will be thinking about recovering and getting back into the Saints' team, because at the moment he has two very good lads ahead of him."
Corbisiero was one of the heroes of the 2013 British and Irish Lions' Test series win against Australia but hasn't played for Northampton this season.
He has been struggling with knee and shoulder injuries in recent years and has not started an England Test since 2012.