The Hamilton Tiger-Cats added quarterbacks Colin Kaepernick and Robert Griffin III to their negotiation list on Monday, sources confirmed to TSN.

Both players became free agents after Kaepernick opted out of his deal with the San Francisco 49ers and Griffin was released by the Cleveland Browns.

Kaepernick and Griffin have each experienced varying degrees of success in the NFL, but are now likely looking to sign with NFL teams in a backup role.

Kaepernick's best years came when he was playing under head coach Jim Harbaugh, helping lead the 49ers to the Super Bowl in the 2012 season.

The 29-year-old, who has 12,271 career passing yards and another 2,300 rushing yards in six NFL seasons, stirred up controversy last season when he kneeled for the American national anthem.

Injuries have derailed Griffin's career after an impressive rookie season that saw him gain more than 4,000 combined yards and 27 touchdowns. After three seasons with Washington, who traded up to draft him second overall in 2012, Griffin played for the Browns last season.