Shaun Wilkinson has joined Michel Kuipers and Simon Rodger on the injury list.
The young utility player broke a bone in a foot in the reserves against Gillingham last week.
The reserves' match against Northampton at Worthing tonight has already been postponed because the Woodside Road pitch is waterlogged.
There is still no sign of an end to the FA investigation into claims by ref Phil Prosser that he and Sheffield United player Peter Ndlovu were racially abused by Albion fans at Withdean in October.
An FA spokesman said: "We received a preliminary report, but there were other issues arising from that and we have asked for further reports from both clubs."
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