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As long as the major league season is on, even if the minor league season has ended, players on a rehab assignment can slightly work off the rust. Obviously you don't get any game data from them to know. Otherwise it would be really annoying to force a guy back to the majors roster with no possibility to work things off. IRL if they didn't have any minors games to play, a team would likely send them to throw some simulated games in their spring complex if they still had a chance to bring them back before the end of the season.
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