Indianapolis Colts running back Marlon Mack tore his Achilles in Week 1 against the Jacksonville Jaguars, a source told NFL Network’s Tom Pelissero.

The Colts initially feared the running back suffered a torn Achilles after he went down with a non-contact injury and was carted from the sideline to the locker room on Sunday.

Mack racked up 26 yards on the ground and added three catches for 30 yards before exiting. He set a career high last season with 1,091 rushing yards and scored eight touchdowns.

The 24-year-old is set to become a free agent at the end of the campaign.

Rookie Jonathan Taylor and Nyheim Hines will now lead the Colts’ rushing attack, with the latter being more involved in the passing game.

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