Triple-A Worcester placed Campbell (lat) on the 7-day injured list Tuesday.
Campbell hadn't played since last Wednesday due to the left lat strain, and his move to the IL likely means that Worcester is no longer counting on the 22-year-old to return before its regular season ends Sunday. The injury brings an end to a whirlwind campaign for Campbell, who opened the season at High-A Greenville and received two promotions while slashing .330/.439/.558 with 20 home runs and 24 stolen bases in 519 plate appearances across three levels. His lat injury isn't believed to be a major concern, so he should head into spring training at full strength.