John Carlson suffers sprained MCL in Vikings practice

AP

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 could keep Carlson out for a while, he replied: “It could. It could. We’ll see. They’ll tell me more when we get back in. But initially, that’s what they told me — sprained MCL.”

Carlson didn’t play last year because of a shoulder problem and the Vikings still signed him to a five-year, $25 million contract in March.

The plan was for him to pair with Kyle Rudolph in a lot of two-tight end sets, but that will be delayed a bit.

Carlson was to undergo an MRI later today to determine the severity of the injury.