The Vikings are among the teams interested in Bears restricted free agent cornerback Bryce Callahan, according to Ben Goessling of the Star Tribune (on Twitter). The Bears used the lowest tender on Callahan, which grants them only the right of first refusal without draft compensation. 
Callahan would provide the Vikings with another option at nickel corner. As it stands, Mackensie Alexander is their only nickel corner with experience. Through two seasons, he has not quite lived up to expectations.
Last year, Callahan graded out as the No. 31 cornerback in the NFL, per Pro Football Focus. He also gave the Vikings an up-close look at what he can do when he returned a punt for a touchdown and deflected two passes against the Vikings in 2017.
Goessling points out that some other options on the market at nickel corner include Rams free agent Nickell Robey-Coleman and Jaguars free agent Aaron Colvin. Goessling also noted that the Vikings had shown interest in Robey-Coleman, 26, last offseason. Terence Newman and Marcus Sherels make up the members of the Vikings cornerbacks set to become free agents.
The Bears have a lot of question marks regarding their secondary leading up to the opening of the new league year, especially if Callahan were to depart. The team has already placed its transition tag on Kyle Fuller and fellow starter at cornerback Prince Amukamara is set to become an unrestricted free agent.