Prince Fielder is expected to have neck surgery next week and miss the rest of the season.
Texas Rangers general manager Jon Daniels said Thursday that the herniated disk in Fielder's neck has gotten worse, and that Dr. Drew Dossett recommended surgery.
Daniels said the surgery is tentatively set for Tuesday. The GM says the team will get a second opinion, but expects the diagnosis to be confirmed.
Fielder had played in 547 consecutive games, then the longest active streak in the majors, before receiving a nerve root block injection Saturday to treat his neck.
Texas acquired Fielder last winter from Detroit in a trade for second baseman Ian Kinsler.
Fielder, who turned 30 earlier this month, had played all 162 games in four of the last five seasons.