Steelers running back Le'Veon Bell suffered a horrible-looking knee injury on Sunday afternoon during Pittsburgh's loss to the Bengals. It is expected to cost him the season, CBS Sports NFL Insider Jason La Canfora reports.

The Steelers believe Bell tore his medial collateral ligament, La Canfora reports, and after doing "thorough testing" with Pittsburgh doctors it "would be shocking" if Bell didn't end up on injured reserve at this point. 

The team is awaiting further confirmation but expects to shut down the superstar running back.

La Canfora previously reported the Steelers expected a "lengthy absence" for Bell after the injury on Sunday.

There was some belief Bell could return because of the MCL nature of the injury. La Canfora reports the injury was indeed limited to the MCL and Bell "should make a full return in 2016." 

DeAngelo Williams will take on the role of full-time starter and Isaiah Pead is believed to be in line for Bell's roster spot. 

Bell is likely going to be shut down. (USATSI)