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The Belarusian was carried off following a strong challenge by Wednesday defender James O'Connor.

Blues boss Alex McLeish said: "Alex is limping heavily. He will have a scan hopefully over the next 24 hours."

Birmingham face Hleb's former club Arsenal in their first Wembley cup final in 55 years on 27 February.

Hleb has recently been sidelined by an ankle injury and was making his first appearance since January.

"It is his knee," said McLeish. "We don't believe there is any cruciate problems but he got a fair rattle. The guy was very late in the tackle.

"We presume we can get something done on Sunday and we will know after that if there is any damage.

"He is a great player and we still believe he will make an impact for us at some stage this season and, hopefully, he will be OK for the final."

Hleb arrived on loan at St Andrew's from Barcelona on transfer deadline day in August 2010 and has made 20 appearances for McLeish's side.

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