The Bears officially signed CB Tre Roberson, formerly of the Calgary Stampeders, to a two-year contract, they announced Wednesday, one day after ESPN's Adam Schefter that Roberson will earn the biggest NFL contract for a CFL import since Cameron Wake arrived with the Miami Dolphins 11 years ago.

Roberson confirmed the news on his Twitter account, writing, "So blessed to be @ChicagoBears thank you for the opportunity in allowing me to help this organization get to the goal of winning a Super Bowl. Thank you to my agent for fighting hard for me through this whole process."

An Indianapolis native, Roberson, 27, was a dual-threat college quarterback who began his career with the Hoosiers before transferring to Illinois State and throwing to ex-Bears WR Cameron Meredith. Roberson accounted for 20 touchdowns and 1,128 passing yards (83-of-138) in his final season at IU before being named a Missouri Valley Conference first-team QB in back-to-back years (2014-15) with the Redbirds.

After going undrafted, Roberson was signed by the Vikings following a rookie minicamp tryout, where he worked out at corner. The 6-0, 200-pound corner played the past two seasons in the CFL, where he was the league's co-leader in interceptions (7) and an All Star last season and won the Grey Cup two years ago.

The Dolphins signed Wake in 2009 to a deal that included $1 million guaranteed. Roberson likely earned as much if not more, signaling the Bears might already have a vision for him on their 2020 depth chart, which could include a starting vacancy opposite LCB Kyle Fuller. Prince Amukamara has no remaining guaranteed money approaching his age-31 contract season after taking a step back like most of his Bears teammates last season.

The 27-year-old Roberson (6-0, 200) was a Missouri Valley Conference first-team selection as a dual-threat quarterback in back-to-back years (2014-15) for the Redbirds after transferring from Indiana.

We'll see whether the rival Vikings were among the nine clubs in addition to the Bears that offered Roberson a contract. Two of their three starters, Trae Waynes and Mackensie Alexander, are free agents, while 29-year-old Pro Bowler Xavier Rhodes is a potential cap casualty coming off his worst season in years.

The Bears, like the Vikings, are near the bottom of the league in cap space, in search of potential bargains to supplement an increasingly expensive star-studded defense that was still quite good but not overly dynamic last season.