This article was originally published on www.si.com/nfl/chargers as Former Chargers player opens up about the cause of Najee Harris' injury. In the wake of the season-ending injury suffered by Los Angeles Chargers running back Najee Harris, commentary about the playing surface has popped up again.

Los Angeles Chargers running back Najee Harris injured his left Achilles tendon on a non-contact play in the second quarter of a 23-20 win over the Denver Broncos on Sunday.

Harris took a step in the backfield at the start of a play in the second quarter when his left ankle gave out as he planted.