Matt Richards has been ruled out of Albion's play-off push for at least a fortnight and possibly as long as four weeks.
A scan has revealed the on-loan Ipswich left-back suffered a torn hamstring in Saturday's home victory over Doncaster.
Boss Dean Wilkins said: "It's a grade two tear which is about two to four weeks. The giveaway was the initial reaction. When you see a player pull up like that it's generally pretty bad."
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