The pair were informed this week that they will not be offered new contracts for 2017.
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Marcon played two senior games for Richmond after making his debut in Round 19 this season. He was selected with pick No.47 in last year’s Rookie Draft.
McBean made five appearances for Richmond, after being recruited with the No.33 selection in the 2012 National Draft.
They join veteran Troy Chaplin in leaving the club this season, after the defender announced his retirement earlier this month.