The midfielder was missing when Blues took on Barnsley on Tuesday night and McLeish has now revealed the player is struggling with an injury he picked up against Southampton last weekend.
"We hope that he will be back for Saturday," McLeish revealed. "He had a scan and there wasn't much on it.
"He has had a bit of back stiffness over the past few weeks and possibly it has come from that, so he is seeing his specialist in London and we hope that he comes back with good news towards the end of the week.
"It is up in his abductor, at the top of his groin."