Alex McLeish will let Barry Ferguson decide whether to undergo an injection which could speed up his recovery.
The Birmingham midfielder suffered a broken rib in the club's Carling Cup final victory over Arsenal and has been sidelined as a result.
His presence was sorely missed on Saturday as the Blues were brought crashing back to earth by local rivals West Brom.
Ferguson must now weigh up whether it would be advisable for him to hasten his return to first-team action.
McLeish insists he will put no pressure on the Scot to have an injection, but admits he is keen to have the influential 33-year-old back in his side.
The Blues boss said: "Barry has had this before when I was at Rangers in a Scottish Cup final.
"Perhaps it was easier then, but there can be things done to alleviate it, in terms of an injection.
"Barry, the doctor and I were discussing it on Saturday because he hates missing matches.
"Of course, he is a key component in our games just like Cesc Fabregas is a talisman to Arsenal and Wayne Rooney for Manchester United. We all have key players.
"But I'm not going to force the player into doing it. His welfare comes first and it must come from him if he makes the decision to have the jab."
Meanwhile, Birmingham new boy Curtis Davies insists the knowledge that the club were to enjoy a Carling Cup party 24 hours after their clash with West Brom was not to blame for their abject showing in a 3-1 defeat.
He said: "The lads came in last week and got their heads down. You should have seen how pumped up they were before the game. It's just things never worked out, out there.
"But people weren't thinking about the civic reception. That was for the fans. It wasn't for us, we had the cup win last week.
"I think it's a bit unfair to judge us like that. West Brom beat us, but not because of Sunday's events."