Allen, searching for a contract after not having his deal renewed at Grimsby, has joined Oxford United on a trial basis.
The search for new faces at the Albion goes on, with rumours of a Centre-back with Division One experience being lined up.
Meanwhile the friendlies continue at Bognor tonight, with Gary Hart expected to make his comeback from a broken leg at some stage in the game.
Bobby Zamora continues his recovery from a summer hernia operation, but is not expected to figure in this week friendlies.
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