Doyle has recently revealed his frustaration at being third choice keeer behind Joe Hart and Maik Taylor but the Blues boss has insisted he needs to have three goalkeepers at his disposal for the remainder of this seasons Premier League campaign.
"He is our third-choice goalkeeper, he's cover," McLeish told the Birmingham Mail.
"We need to have three good goalkeepers, Doyley's had a fair bit of experience without being given the total amount of experience of the other two. But he's still had a fair amount of experience so we know that we've got a terrific third goalie there.
"It must be frustrating for him but he's a great type, he trains hard with goalkeeping coach Dave Watson and he knows that happens in football sometimes.
"You might not be first choice but you're part of the squad and you're getting paid good wages, then you have to give it as much as you can professionally."