The team also activated left-hander Wade Miley from the 60-day IL ahead of his start Tuesday night against the Cincinnati Reds. He allowed three runs (two earned) in four innings, and didn't factor into the decision as Chicag won, 9-3.
Contreras, 30, has been dealing with the issue since rolling the ankle while running the bases in the Field of Dreams game against the Reds last month. He has a career-high 128 OPS+ in 107 games this season, his last before becoming a free agent.
Miley, 35, has been on the injured list since mid-June because of left shoulder issues that had limited him to only four starts this season. He was claimed off waivers from Cincinnati last offseason after spending 2020 and '21 with the Reds. He has a 3.13 ERA in 23 innings pitched this year.
The Cubs on Tuesday also activated outfielder Michael Hermosillo from the injured list and designated pitchers Luke Farrell and Nicholas Padilla for assignment.