CINCINNATI -- Bengals safety George Iloka will miss three to four weeks with a knee sprain, according to a report by the Cincinnati Enquirer.

That timetable would likely sideline him for most of the preseason, as the Bengals play their first preseason game on Aug. 11 against the Buccaneers.

Iloka hurt his right knee in Sunday's practice while the Bengals were running through their first segment of team drills. Iloka grabbed at his knee as he fell to the ground, then crawled off the field to the sidelines, where he was examined by trainers.

Iloka was given ice for his knee, but didn't leave practice until much later. He watched most of the session while sitting on a cooler and left on a cart with fellow safety Derron Smith as practice was winding down. He was not in attendance for Monday's practice.

Iloka, a fifth-round draft pick in 2012, has been a mainstay in the Bengals' defensive backfield since 2013. He started all 16 games last season and finished with three interceptions and seven pass breakups.