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Colts: Darius Leonard ruled out Sunday vs. Falcons; Marlon Mack on track to play

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Join insiders Joel A. Erickson and Jim Ayello as they preview Colts versus Falcons. Clark Wade, Clark.Wade@Indystar.com

INDIANAPOLIS -- The Indianapolis Colts’ defense has been dealt a significant blow. Darius Leonard (concussion) has been ruled out for Sunday’s game against the Atlanta Falcons.

The All-Pro linebacker remains in concussion protocol and will miss the second game of his short career.