Marney, out since January with knee ligament damage, and recent arrival Wells (foot) are being phased into the Under-23 set-up to continue rehabilitation but are still some way from fitness.
Walters could be out for a couple of months with a knee problem, leaving Chris Wood, Ashley Barnes and Sam Vokes to contest the attacking roles as Sean Dyche’s men look to maintain their fine start to the season.
The Hammers are without James Collins and there is a question mark over whether Pedro Obiang will be risked from the start and Chicharito may be on the bench having only returned to first team training today.