Striker Iwelumo was forced to pull out after getting a thigh injury on Saturday at Sheffield Wednesday. He joins Cooke, Hoekstra and Oulare three of our best players on the injury list.
Director of football John Rudge said: "Chris is very doubtful for the game tomorrow I would rate him as less than 50-50 at the moment.
"We've already got a very small squad, smaller than last season's, but this leaves us very thin, so we'll have to see whether we can bring someone in on loan."