How Tyler Thornburg ended up on the injured list

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TORONTO -- The quest to find out if Tyler Thornburg can actually be a productive member of the Red Sox' bullpen has been put on the hold.

The reliever was placed on the 10-day disabled list Thursday morning with a right hip impingement. He was replaced on the 25-man roster by Travis Lakins.

"Before the game yesterday he went to the training room. He’s sore," said Red Sox manager Alex Cora. "It’s one of those you have to stay away from him anyway. Get him right. Where we’re at right now obviously it’s a tough one because it might take three or four days or it might take 10 or 15 days. Stay away from him. Go in the IL and we have Travis here. ... (Head trainer) Brad (Pearson) brought it up yesterday before the game. Today he showed up he was more than just soreness. So we had to make a move."

Thornburg last pitched Tuesday night, giving up a pair of runs in his one inning of work. The righty has struggled to find command of his fastball for much of the season, leading to a 7.71 ERA.

Lakins was summoned after playing for Triple-A Pawtucket in Moosic, Pennsylvania (Scranton Wilkes-Barre), having to fly to Philadelphia before catching a plane to Toronto Thursday morning. (As Cora explained, all Triple-A players -- particularly those on the 40-man roster -- are expected to carry their passports at all times.)

The righty reliever last pitched May 19, having not allowed a run in either of his last two outings. The 24-year-old has been up and down this season with the PawSox, totaling a 4.02 ERA in 14 outings. He has had particular trouble against lefty hitters, giving up five runs on 12 hits over 4 2/3 innings.

This is the second stint with the big league club for Lakins this season, having appeared in one game during his previous visit to the big leagues.