After taking on Norwich on Wednesday - Albion have had little time to recover ahead of taking on Millwall at The Den on Saturday.
Jonny Drury gives his predicted side ahead of the game:
Mason indicated prior to Norwich that changes would be on the cards and he would need to use his whole squad.
He opted for just the one against the Canaries with Josh Maja coming in - but for me he will shuffle a few more around for another tough test.