GOALKEEPER David Forde has been told that an injury to his left knee requires surgery and he could be out of action for up to six weeks.
The Lions stopper is due to have an operation later today after a scan on Monday confirmed that he needs to go under the knife in order to correct the problem.
Millwall have not put an official timescale on Forde's recovery but the severity of the injury is being compared to Liam Trotter's recent knee problem.
Stephen Bywater will fill in for the Republic of Ireland star in his absence, starting against AFC Wimbledon tonight, but Steve Lomas may bring in further reinforcements on loan.
Academy 'keeper Denzil Gerrar is likely to be on the bench against the Dons.