FORT WAYNE, Ind. (FORT WAYNE'S NBC) - Frank Reich confirmed in an interview on Monday that running back Marlon Mack ruptured his Achilles.
Mack left the game in the second quarter after four carries for 26 yards.
As Mack hits the sideline, Reich moves rookie RB Jonathan Taylor to the starting role.
Taylor is in his first year with the Colts, a player out of Wisconsin.