NEW YORK — Matt Harvey has a partially torn ligament in his right elbow, a potentially devastating injury for the pitcher that had given the foundering New York Mets reason to be hopeful about their future.

For now, the 24-year-old Harvey and the Mets hope that he will be able to avoid reconstruction surgery on the ulnar collateral ligament. A full prognosis will not be made until swelling in the elbow goes down in about two weeks.

“It was tough. Obviously it was the last thing I was expecting when I went this morning,” Harvey said Monday. “I am going to do everything I can to avoid surgery.”

The National League’s All-Star Game starter on his home field this July, Harvey has been experiencing forearm tenderness for a month or two but could not pinpoint exactly when it began. The discomfort increased during his start Saturday against the Detroit Tigers, when he allowed a career-high 13 hits.

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• Oakland placed right fielder Josh Reddick on the 15-day disabled list with a sprained right wrist. He injured the wrist on Sunday and was hitting .213 with 10 homers and 46 runs batted in in 97 games. The Athletics called up first baseman Daric Barton from Class AAA Sacramento.

• Colorado center fielder Dexter Fowler was taken out of the game against San Francisco because of a left lateral knee bruise. The Rockies said Monday night that he is day to day.

• San Diego promoted outfielder Reymond Fuentes and right-hander Anthony Bass from Class AAA Tucson.

• Philadelphia placed outfielder Casper Wells, a former Mariner, on the disabled list because of vision problems two days after he took the loss as an emergency pitcher in an 18-inning game.