Millwall midfielder Ashley Grimes has joined the club's lengthy injury list.
The 22-year-old was forced off after 70 minutes of the Lions' reserve-team clash with Eastbourne on Tuesday with a hamstring strain.
Coach Richard Shaw told the club's official website: "We don't know if it just a strain yet. But we should have a better idea over the next day or two."
Kenny Jackett's squad has been plagued by injuries with 11 first-team players currently on the sidelines.
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