The striker injured his groin against Reading last Saturday and had to be replaced at the half-time break. He was used as an 86th minute replacement for Freddie Eastwood against Crystal Palace on Tuesday night but will not travel to Home Park in an attempt to make the home game on Monday against Charlton Athletic.
"I won't play Leon because he's not ready,"said Chris Coleman to the CT. "I didn't want to use him on Tuesday but the boys were tired up front because they had worked so hard. He needs a complete rest and perhaps then he'll be OK for Monday."