It probably will be Blind LB and Darmian RB by default. I'd like to keep Carrick in the side but with another away game next weekend he'll need to be managed. Schweinsteiger would be the ideal foil... I think of the two games though, Carrick would be more important against Palace. West Brom don't pose as much of an attacking threat and given their style of play and set up, we'd likely get away with Herrera and Pogba in a midfield two against them more so.
Wide options a bit worrying again with Valencia, Mkhitaryan and Martial out. Martial been hit and miss but with the lack of an attacking threat from left back he will be a miss. Right side depleted. No obvious replacements on current form.