The Tampa Bay Rays acquired right-handed reliever Jesse Crain from the Chicago White Sox for future considerations in what one source described as a "very convoluted" deal.
Crain is presently on the disabled list with shoulder trouble and hasn't pitched since June 29.
The Rays and White Sox will negotiate a cash/player combo going to Chicago over the next several weeks.
Crain, who will be a free agent after this season, is sporting a 0.74 ERA and 46 strikeouts in 38 appearances this season.
The deal was announced before the Rays faced the division-leading Red Sox in Boston on Monday night. Tampa Bay entered the night one-half game behind Boston in the AL East.
Chicago, which was in last place in the AL Central, had lost nine of 12 heading into Monday night's game in Cleveland. Crain was on the field hugging his former teammates as batting practice concluded.
Crain made the All-Star team for the first time this year but did not pitch because he was injured.
Information from the Associated Press was used in this report.