The Indianapolis Colts and veteran quarterback Joe Flacco have reached an agreement on a one-year deal worth up to $8.7 million, sources told ESPN’s Adam Schefter on Wednesday. Flacco, who played for the Cleveland Browns last season and won NFL Comeback Player of the Year honors, will receive $4.5 million guaranteed in the deal. In Indianapolis, Flacco will back up and mentor second-year quarterback Anthony Richardson. Flacco also will provide some peace of mind for the Colts after Richardson missed 12 games as a rookie following a season-ending shoulder injury. Flacco, 39, won the Super Bowl with the Baltimore Ravens in 2013 and was named Super Bowl MVP. He has thrown for 43,936 yards and 245 touchdowns in a career that also includes time with the Denver Broncos, New York Jets and Philadelphia Eagles.