In January 1990, the Blues temporarily brought him to St. Louis as a de facto goaltender coach to consult on the development of Blues prospects Vincent Riendeau and Curtis Joseph. That summer Thomas was officially named a Blues assistant coach, with specialty in goaltending, and was specifically hired by head coach Brian Sutter for his experience.
In January 1990, the Blues temporarily assigned him to St. Louis as a de facto goaltending coach to advise on the development of prospects Vincent Riendeau and Curtis Joseph. That summer Thomas was officially named a Blues assistant coach, specializing in goaltending, and was specifically hired by head coach Brian Sutter for his expertise.