Colin made 199 appearances for us between 1993-99 before returning to club as reserve coach in 2001. He also won 36 caps and played in the World Cup for Scotland.
He will be answering the questions on Thursday - so send in yours and he will answer the best of the bunch.
To have a chance of Colin answering your question, simply e-mail it to us by clicking here and please remember to include your name!
Reserve team boss Colin Calderwood is next in the Q&A chair - now we need your questions!