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Capper has been released by Sunderland following their relegation from the Premiership, and has played alongside Iron defender Cliff Byrne at both club and international level.
He has had trials with York City and Swindon Town, and has trained with Chesterfield.
Iron manager Brian Laws will name a strong side, to take on a Man U side made up largely of youth players.
United's only missing player is right-back Nathan Stanton, with a slight hamstring strain the reason given for his absence.