Millwall defender Darren Ward will be sidelined for around three weeks with a knee injury.
The on-loan Wolves centre-half missed Saturday's 5-0 win over Tranmere after jarring his knee in training on Friday.
Lions assistant boss Joe Gallen said: "We are disappointed to lose Darren - but at one stage we thought he could miss the rest of the season, so in that respect we are pleased."
Midfielder Ali Fuseini has also picked up a knee problem, but he is expected to return within two weeks.
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