Millen will still be playing for Saints, so as well as a new assistant we've got ourselves a new player. He can play in midfield, though has recently been playing in defence for Clyde, so is possibly a player like Tommy Turner.
Due to a change in the transfer rules Millen can play against Ross County on Saturday, rather than having to wait to make his debut against his old side the following week.
Story source: The Official St. Mirren Website