The Los Angeles Chargers placed Austin Ekeler on injured reserve Friday, meaning the running back will miss at least the next three weeks.
Ekeler suffered a hamstring injury in the Chargers' Week 4 loss to the Bucs and is expected to miss four to six weeks, a source told ESPN's Adam Schefter.
Los Angeles promoted Tyron Johnson to its active roster and signed former Dolphins and Jets running back Kalen Ballage to the practice squad.
Ekeler signed a four-year, $24.5 million extension with the Chargers in the offseason. After a lengthy contract dispute with Melvin Gordon, Los Angeles signed Ekeler long term instead.
Gordon eventually signed with the Denver Broncos, clearing the way for Ekeler to be the Chargers' feature back.