Quarterback Philip Rivers stands to benefit from McCoy, who turned Tim Tebow into a functional starter in 2011 and helped Peyton Manning produce a monstrous comeback campaign with the Denver Broncos in 2012.
"Of the potential candidates, I can honestly say this is the guy I was hoping for," Rivers told Marty Caswell of XEPRS-AM San Diego on Tuesday. "I feel great about it."
Rivers encountered a rocky road this season. His 26 touchdowns marked his lowest output since 2007, and his 15 interceptions often came at critical moments late in games for a Chargers team that missed the playoffs for the third straight season.
It doesn't hurt that San Diego is getting a guy who just spent the past year designing an offense for the 13-3 Broncos, kings of the AFC West.
Said Rivers: "I think it's a plus, certainly ... it's certainly a positive."
Follow Marc Sessler on Twitter @MarcSesslerNFL.