Thornburg (arm) is scheduled to pitch in a minor league game Tuesday, Jason Mastrodonato of the Boston Herald reports.

Thornburg came out of Saturday's bullpen session without incident and now will begin the progression toward the regular season. The Red Sox feel there's enough time remaining in the Grapefruit League season for him to be ready by Opening Day. If he's not, the backup plan calls for Joe Kelly to pitch the eighth inning for Boston.

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