Cubs placed RHP Hector Rondon on the 15-day disabled list, retroactive to August 17, with a right triceps strain.
Hector Rondon (triceps) took a loss and a blown save in his return to action Sunday night against the rival Cardinals.
Hector Rondon (triceps) is hoping to return on Saturday.
Cubs manager Joe Maddon said that Hector Rondon (triceps) is "trending in the right direction."
Hector Rondon was unavailable Tuesday due to a triceps issue.
Hector Rondon notched his 18th save of the season Sunday in the Cubs' 5-4 defeat of the Brewers.
Hector Rondon converted his 17th save with a scoreless inning Friday against the Brewers.
Hector Rondon retired the only two batters he faced to nail down his 16th save of the season in Monday's win over the Mets.
Hector Rondon earned his 14th save of the season Sunday in the Cubs' 6-5 defeat of the Pirates.
Hector Rondon pitched the last four outs of the game to earn his 13th save of the season on Friday.
Hector Rondon blew his second save in as many days as the Cubs fell to the Nationals on Wednesday.
Hector Rondon blew his first save of the season but earned a victory in Tuesday's win over the Nationals.
Hector Rondon allowed a solo homer but hung on to record his 11th save of the season in Monday's win over the Phillies.
Cubs manager Joe Maddon said Hector Rondon (back) was available to pitch Thursday against the Dodgers.