The Red Sox announced that pitcher Anthony Varvaro has been returned to the club. The right-hander was designated for assignment by the Red Sox in late April and claimed off waivers by the Cubs days later.

Varvaro, it turns out, has a torn right flexor tendon and will undergo surgery Tuesday ending his season, reports Cormac Gordon of the Staten Island Advance.com.

“The tendon is partially torn off the bone, but the elbow is stable otherwise,” the 30-year-old told Gordon. “I was worried I might need another Tommy John surgery. That’s not the case. This is the best possible outcome.”

Rehabilitation is expected to last six months, so Varvaro could resume throwing in November. The Red Sox say they were unaware of how severe the injury was, so both clubs agreed that it “would be appropriate to return Varvaro to the Red Sox for placement on the disabled list in accordance with the major league rules.”

The Red Sox designated Varvaro for assignment on April 29th and the Cubs claimed him off waivers on May 3rd. Three days later, the Cubs DFA’d Varvaro and subsequently outrighted him.

Varvaro posted a 2.74 ERA with 6.5 K/9, 2.7 BB/9 and a ground-ball rate near 48 percent with the Braves from 2012-13. With the Red Sox this year, Varvaro appeared in nine games and totaled 11 innings. The five runs he surrendered aren’t particularly concerning, but his velocity was down from an average of 92.5 mph in 2014 to 91.1 mph in 2015. That, combined with the 14 hits and six walks he yielded in his 11 innings, likely aided in his swift exit from the Boston organization. Now, for the time being, he’s back in Boston.