Millwall striker John Marquis has been ruled out until the new year with a groin injury.
The 20-year-old youth-team graduate, who has yet to make an appearance for the Lions this term, is to visit a specialist to determine the extent of the problem.
"John has suffered a cruel blow and has significantly disrupted a groin muscle on his right side," physio Bobby Bacic told the club website.
"He previously had surgery on his left side but this is a totally different type of injury and we will see a specialist over the coming days to discuss John's options.
"However, he will not be available for selection this year."