The Bears signed Ayers to a reserve/future contract Monday.
Ayers underwent core-muscle surgery on Tuesday according to DKPittsburghSports.com, reporter Mark Kaboly.
Ayers (coach's decision) is inactive for Sunday's AFC championship game against the Patriots, TribLive.com reports.
Ayers totaled five receptions for 44 yards and a touchdown in the Steelers' overtime win against the Browns on Sunday. He also ran twice for minus 12 yards.
Ayers caught his only target for nine yards in the Steelers' 31-27 win over the Ravens on Sunday.
The Steelers have promoted Ayers to their active roster.
The Steelers selected Ayers in the seventh round of the 2016 NFL Draft, 229th overall.