RENTON — Seahawks tight end Anthony McCoy loomed as one of the team’s potential feel-good stories for 2014 as he attempted to return after missing all of last season with a torn right Achilles tendon.

McCoy’s comeback, though, took a potentially disastrous turn during Tuesday’s practice when he was carted off with an injury to his left Achilles tendon. McCoy was visibly upset as he departed after being injured on a play in which there appeared not to be any real contact.

Coach Pete Carroll said after practice that the “early indications’’ were that McCoy had suffered the same injury as a year ago but to his other Achilles.

“If it is what they think it is, it’s just a real heartbreaker,” Carroll said. “He worked so hard to get back.”

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Seattle re-signed McCoy in the spring deeming him on the road to full recovery from his injury. He had played well during early training-camp practices, battling with Luke Willson for a backup spot at tight end behind presumptive starter Zach Miller.

More significant than his roster spot designation, though, is that McCoy figured to be a member of Seattle’s rotation at tight end, giving the team three players with experience at that spot it could rely on — McCoy started 14 games for Seattle from 2010-12.

Seattle, which often uses sets with multiple tight ends, has only two other tight ends on the roster — third-year player Cooper Helfet, who has been primarily on the practice squad in the past, and undrafted free-agent rookie RaShaun Allen.

If McCoy is lost for the year, it could compel Seattle to hunt for another tight end. Seattle was reported to have shown interest in the offseason in free agent Jermichael Finley, who spent the last six years with Green Bay.

Finley, though, is coming off surgery to fuse his vertebrae, and it’s reported that he would receive $10 million tax-free from an insurance policy if he never plays football again, which might make Finley reluctant to sign the kind of short-term, low-cost deal teams may be offering.

Several other players suffered injuries in practice Tuesday but none were deemed serious.

Seahawks add Winston

Seattle made an intriguing signing at right tackle Tuesday, agreeing to a deal with free agent Eric Winston, a nine-year veteran who has 119 career starts, including all 16 last year for the Arizona Cardinals.

Winston will compete for the starting right tackle spot with second-year player Michael Bowie and rookie Justin Britt after Seattle lost last year’s starter, Breno Giacomini, in free agency. Bowie has been out since the first day of camp with a shoulder injury, but could be back Wednesday.

“Just looking for depth and a competitive guy there to come in to that spot,’’ Carroll said. “Liked the fact that he’s got background and experience. We are very young in the backup guys (at tackle). … Eric’s done a lot of playing in his time so we’ll see how that works out.’’

Winston said he had offers from a number of teams but liked the opportunity in Seattle..

Bob Condotta: 206-515-5699 or On Twitter @bcondotta.