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Jack Dempsey, Associated Press
Denver Broncos quarterback Peyton Manning (18) throws against the Kansas City Chiefs during the first half of an NFL football game against the, Sunday, Nov. 15, 2015, in Denver.

ENGLEWOOD, Colo. — Peyton Manning has a partially torn plantar fascia in his right foot, a person familiar with the situation said Monday.

Speaking on condition of anonymity because the Broncos haven't addressed specifics of Manning's injury, the person confirmed reports from ESPN and KCNC-TV in Denver that Manning has a tear in the thick tissue that connects the heel bone to the toes and creates the arch of the foot.

It's uncertain how long — if at all — the nagging injury would sideline Manning. He was benched for the first time in his career Sunday after throwing four interceptions in Denver's 29-13 loss to Kansas City.

Manning has been dealing with the sore foot for a while. It was especially bothersome after playing on the artificial turf in Denver's 27-24 loss at Indianapolis on Nov. 8, and Manning was extremely limited in his practice last week.

On Saturday, he showed up with a new ailment: sore ribs. In light of that, coach Gary Kubiak said he regretted starting Manning against the Chiefs but had done so out of deference to the five-time MVP.

Kubiak didn't replace Manning until late in the third quarter after Manning had been picked off four times, completed just 5 of 20 passes for 35 yards and posted a career-worst 0.0 passer rating.

Longtime backup Brock Osweiler finished up.

Kubiak said he planned to start Manning at Chicago on Sunday if he's healthy.

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