The Blues midfielder has not represented his country since being given an indefinate ban by the Scottish FA prior to a World Cup qualifier against Iceland last April.
Ferguson has, however, confirmed that he has held talks with new manager Craig Levein about a possible return to the Scotland squad.
"As soon as Craig got announced as Scotland manager, I said he was the right man for the job," Ferguson has said.
"He is the only guy I would probably consider coming back to play for.
"Myself and Craig Levein have agreed with each other to keep what has been said private. I've still got a lot of thinking to do and I am nowhere near a decision.
"I am fully committed to Birmingham. I will give them a full season. They took a chance on me when people were knocking me down. I owe them everything.
"I have all that to take into account and it will be a long time before I decide what I do. I am nowhere near a decision and I need to sit down and go through a lot of things.
"If it means I go away and come back, and I'm not going to play here well, there is no chance of me going back. There is still loads to discuss, but the meetings were good and he is a guy I respect and he has given me time to go away and think about it.
"There are loads of things I have to take into consideration and I have to be honest with the gaffer (Alex McLeish) as well. He has given me a platform to come down here and play.
"I've not had a long chat with him yet. I need to sit down and see what his thoughts are."
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