The suspension stems from a 2013 DWI arrest in Texas. Ratliff pleaded guilty to the charge in May. He was fined and given a year of probation.
Ratliff is entering his 11th season in the NFL, his third with the Bears. Last year, in 11 games, Ratliff recorded 37 total tackles, including 6.5 sacks.
He is in the last year of his contract with the Bears.