The defender missed the defeat to Bournemouth on Easter Monday after suffering a back spasm in the 2-1 win against Leyton Orient.
Brian Laws will give Reid as long as possible to declare his fitness before selecting his side.
The manager, who has no other major injury concerns for the game, is expected to recall Akpo Sodje to the starting line-up against his former club as the Iron look to end a five-match losing run away from home.
United are in the bottom four on goal difference, but 20th-placed Oldham have played two games fewer at this late stage of the season.
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