Chalk this up as a bit of a surprise, at least to me.
Honestly, I'm not sure what the team has to decide about. Cassel's contract calls for him to make a shade over $4 million this season, and while that sounds like a lot of money for a backup. . .and it probably is. . .with starting quarterback Teddy Bridgewater having a cap figure of just over $1.5 million for 2015, it isn't something that the team should have to worry about that much.
If that's not a good enough reason for the Vikings to keep him around, the fact that the free agent quarterback market can generously be classed as "below average" probably should be. Seriously, there is really nobody that's going to be hitting the market next week that anyone should be getting that excited about. Cassel's not a great quarterback by any definition, but honestly, he's a whole lot better than what's going to be floating around out there in free agency.
It would be a bit of an upset if Matt Cassel wasn't serving as Teddy Bridgewater's backup in 2015. But, at this point in the off-season, it's something that the Vikings are apparently considering.