KANSAS CITY, Mo. -- Chiefs running back Isiah Pacheco is expected to land on injured reserve after suffering a fibula injury during Sunday's game against the Cincinnati Bengals, sources told ESPN's Adam Schefter on Monday.

Pacheco underwent X-rays on Sunday night and will have an MRI on Monday to determine whether there is a fracture and/or ligament damage to his ankle, sources told ESPN. He left Arrowhead Stadium on crutches and with his foot in a walking boot after Sunday's 26-25 win.

Pacheco, 25, has been the Chiefs' leading rusher in each of the past two seasons. He rushed for 90 yards on 19 carries and caught five passes for 21 yards Sunday. In two games this season, he has rushed for 135 yards and a touchdown while averaging 4.0 yards per carry.

The Chiefs also have undrafted rookie Carson Steele and veteran Samaje Perine at running back. Steele has rushed for 27 yards this season. Perine, signed by the Chiefs after he was released by the Denver Broncos at the cut-down date, caught one pass against the Bengals for 3 yards.

Clyde Edwards-Helaire, the Chiefs' leading rusher in 2020 after being picked in the first round of that year's draft, is on the non-football injury list. The earliest he could return to play for the Chiefs is a Week 5 game against the New Orleans Saints.