Cahill (knee) made his first rehab appearance Monday, throwing 2.2 innings for Triple-A Iowa, Carrie Muskat of MLB.com reports. Cahill gave up three runs on four hits and three walks, so he'll probably need a few more appearances before he gets activated.
The Cubs placed Cahill on the 15-day disabled list Friday with a knee issue, Jesse Rogers of ESPN Chicago reports. The extent of Cahill's setback is not certain, but he will not open the second half on the Cubs' active roster. Clayton Richard will replace him in the team's bullpen.
Cahill struck out two and walked one over three scoreless innings against the Mets on Friday. The Cubs needed to dip into their bullpen when starter Jason Hammel got rocked, and Cahill at least was able to stop the bleeding. For the season he has a 2.37 ERA and 1.29 WHIP in 31 appearances.
Cahill struck out three in 1.2 scoreless innings against the Phillies on Friday. Cahill gave up three hits in the performance. He's been an unsung hero in the Cubs' bullpen this year, as he has a 2.35 ERA, but his walk rate (14 walks in 23 innings) contribute to his below-average WHIP of 1.39. Still, in his last five appearances - all scoreless - he has struck out 12 and walked three in eight innings.
Cahill struck out two batters in 0.2 scoreless innings of work against San Diego on Tuesday. Cahill has now tossed 7.1 straight scoreless innings while striking out eight in that span. Once a starting pitcher during tenures with Oakland and Arizona, the 28-year-old has now settled into a relief role with Chicago. Given his experience as a starter, it's not out of the question that he could start a few games for the Cubs in 2016 but given his success so far in his relief role, he will likely remain there for the foreseeable future.