Albion striker Leo Ulloa is facing up to eight weeks on the sidelines, after scan results showed the striker has broken a bone in his foot.
The Argentinian underwent minor surgery yesterday to have a small screw inserted, and is now expected to be out until December.
Elsewhere Kemy Agustien is unlikely to feature this weekend, after suffering a calf injury, further limiting Oscar Garcia's midfield options, with Liam Bridcutt and Andrea Orlandi both still absent.
Andrew Crofts is available. He has a minor hip problem, but can play this weekend, but will use the international break to recover from the injury. Crofts was suspended for the first of Wales' two World Cup qualifiers, and his absence has been sanctioned by the Welsh FA.
Also missing are longer-term casualties Craig Mackail-Smith, expected back in late November, and Will Hoskins, who is out until next spring.