ARLINGTON, TEXAS – The White Sox put right-hander Reynaldo Lopez on the 10-day disabled list (retroactive to August 18) with a strained back Saturday and purchased the contract of right-hander Danny Farquhar from Class AAA Charlotte.

The Sox also said Lucas Giolito, who was pegged to make his Sox debut Monday in the doubleheader at home against the Twins, would start in Lopez’ place Tuesday instead. Carson Fulmer will be called up from Charlotte as the 26th man and start Game 2 of the twinbill, with Carlos Rodon pitching Game 1.

Lopez, 23, one of the Sox’ top pitching prospects, made only two starts with the Sox after getting called up from Charlotte last week. He left his second outing against the Rangers during the fifth inning Thursday with soreness on his right side.

After pitching six innings of two-run ball against the Royals last Friday, Lopez gave up six runs on five hits and four walks over 4 1/3 innings Thursday. He said he woke up Thursday with soreness in his side but did not say anything about it to the Sox coaching staff. It turns out the issue is in his back, Renteria said Saturday.

Farquhar, 30, was signed as a minor-league free agent on July 24 after he was designated for assignment by Tampa Bay on June 29 and released on July 19. He gave up three earned runs over nine innings with one save and 12 strikeouts with Charlotte. He made 37 relief appearances with the Rays this season, going 2-2 with a 4.11 ERA.

 The Sox 40-man roster is at 36.