At his Monday press conference following the Colts' 22-14 win over the Titans, head coach Chuck Pagano announced that running back Dan Herron tore his pectoral muscle in the game. He will require surgery and be placed on Injured Reserve, ending his season.

"Boom" Herron is the third Colts running back to land on IR this year, joining Ahmad Bradshaw and Vick Ballard. Herron played primarily on special teams.

Other injury news:

Defensive end Ricky Jean Francois tore his plantar fascia (foot injury) and will miss 2-4 weeks. This is a similar injury that Bjoern Werner sustained earlier in the season.

Offensive guard Jeff Linkenbach, who started Sunday in place of the benched Mike McGlynn, suffered a quad injury. He'll be evaluated week to week.

Pagano said Fili Moala and rookie Montori Hughes will step in and play defensive end while RJF recovers. Placing Herron on IR will open up a roster spot, possibly for another wide receiver.

Herron's injury all but guarantees that former Steelers back Chris Rainey will stay on the Colts roster.