The Icelandic striker, who has been struggling with a groin injury, is ineligible to face Rangers under the terms of his loan deal from Loftus Road.
Danny Graham is likely to start in attack with on-loan Arsenal midfielder Henri Lansbury tucked in behind.
Skipper Jay DeMerit came off with a knock during Saturday's 4-1 defeat at Leicester and could miss out, with Martin Taylor his likely replacement at centre-half.
Full-back Lloyd Doyley and winger Will Buckley remain doubtful with hamstring injuries.
Rookie wideman Michael Bryan put in an impressive cameo from the bench at the Walkers Stadium and will hope to be involved again.