An MRI Monday morning confirmed Indianapolis Colts running back Marlon Mack suffered a torn Achilles. Douglas DeFelice-USA TODAY Sports

The Colts’ fears have been confirmed. On Monday morning, doctors diagnosed running back Marlon Mack with a torn Achilles (Twitter link via NFL.com’s Tom Pelissero). Mack will be placed on injured reserve and shut down for the remainder of the season.

Mack went down in the middle of the Jaguars’ 27-20 upset win over the Colts. His game – and his season – came to an end after four carries for 26 yards plus three grabs for 30 yards. For Mack, it’s devastating for obvious reasons, but also for contractual reasons. The tailback is in his walk year and he was aiming for a big payday in the spring.

Last year, Mack went off for a career-high 1,091 yards despite missing a pair of games. The Colts, meanwhile, didn’t engage in serious extension talks before the start of the season. Instead, they drafted Jonathan Taylor in the second round, an indication that they were already thinking about going younger/cheaper. Taylor and Nyheim Hines figure to lead the way for Indy’s backfield moving forward while Mack concentrates on rehab.

Philip Rivers and his new-look backfield will try to get in the win column on Sunday when they face the Vikings.

This article first appeared on Pro Football Rumors and was syndicated with permission.

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