Darron Cummings/Associated Press
Philip Rivers turned 38 in December, so he understandably put a high priority on pass protection when he made his decision in NFL free agency.
During a conference call Monday, Indianapolis Colts offensive coordinator Nick Sirianni told reporters Rivers was sold on the strength of the team's offensive line.
"The big part of Philip being here is Anthony Castonzo. Quenton Nelson. Ryan Kelly. Braden Smith. Mark Glowinski," Sirianni said (via NFL.com's Nick Shook). "Those guys are studs.
"That's something that he just kept mentioning after we signed him of how valuable those guys were to him.