Mark Walton's run of 22 consecutive appearances for Albion is under threat.
The big Welsh goalkeeper hurt a knee in training and has a scan today on suspected cartilage damage.
Manager Micky Adams says it is too early to say whether Walton will be fit for Saturday's trip to York.
Teenage goalkeeper Greg Shannon plays his second game for the Reserves against Portsmouth at Bognor tonight (7.30).
The Northern Ireland youngster, on trial from Sunderland, made his debut in last week's 1-1 draw against Wycombe Wanderers.
Injury-plagued Darren Carr makes his latest comeback from a calf problem, but knee damage rules out Ryan Palmer.
Albion Reserves: Shannon; Andrews, Campbell, McPherson, Carr, Westcott, D. Davis, Armstrong, Aspinall, Thomas, Ramsay.
Tickets for the home match against Peterborough United on Wednesday, April 26 have sold out.
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