Western United coach Mark Rudan is set to lose one of his assistants with John Hutchinson poised to return to his old employers in the United States.

Sources close to the A-League expansion club have confirmed that Hutchinson has quit his post after less than half a season and will return to Major League Soccer club Seattle Sounders shortly.

Mark Rudan's assistant coaches at Western United, John Hutchinson and John Anastasiadis, could both be about to leave. Credit:Getty Images

Previously the head coach of Seattle's reserves team, Hutchinson's new job will be as an assistant to Brian Schmetzer, the manager of the Sounders in MLS.

Meanwhile, rumours in Melbourne suggest that Rudan's other assistant, John Anastasiadis, is a candidate to join Ange Postecoglou's coaching staff at Yokohama F. Marinos.