John Carlson suffers sprained MCL in Vikings practice

Tight end John Carlson was the premier free agent signing of the Vikings’ offseason. Now they’re going to have to wait a little longer to see how much he helps. According to coach Leslie Frazier, via Tom Pelissero of 1500ESPN.com, Carlson suffered a sprained MCL in practice Tuesday. When Frazier was asked if the problem…