Roberson, 27, played for the Calgary Stampeders for the past two seasons, recording seven interceptions in 2019. Roberson was a coveted free agent, as the Bears were one of 10 teams that submitted a formal offer to him.
Roberson and the Bears agreed to a deal that with bonuses will be the largest for a player transitioning from the CFL to the NFL since the Dolphins signed pass rusher Cameron Wake in 2009, a source said.
Roberson played quarterback at Indiana and Illinois State before switching to cornerback after his collegiate career ended. He signed with the Vikings after going undrafted in 2016. Roberson has never played in a regular-season NFL game. The Vikings cut him in September 2017.
The Bears are adding Roberson with the expectation that he will compete for a role at cornerback. Aside from Pro Bowl cornerback Kyle Fuller, the Bears have lacked depth at that position.
Veteran cornerback Prince Amukamara, the Bears' starter opposite Fuller since 2017, could be a candidate for a release this offseason as Chicago seeks to clear salary cap space.
The Bears haven't yet made the signing of Roberson official. The news was first reported by Adam Schefter of ESPN.