The loss of Le Bihan may come as more of a surprise but the ex-Peterborough United player disappointed after a promising start to the season on the left of midfield.
Reds meanwhile have offered terms to young defender Ellis Hooper, full-backs Ben Judge and Ernie Cooksey as well as McDonnell who is thought to have attracted interest from higher level clubs after a prolific debut season at the Broadfield Stadium.
Goalkeeper Andy Little has signed a one-year deal to stay with the club, along with midfielder Mo Harkin who has agreed an extension to his current deal.