ESPN.com's Ben Goessling initially reported the news.
While playing with the Hamilton Tiger-Cats last season, the 25-year-old ranked 12th in the CFL with 1,030 receiving yards.
It's a homecoming for Sinkfield, who hails from Hopkins, Minnesota. Attending college at Northern Iowa, he also made a splash at the University of Minnesota pro day in 2013, running a 4.19 40-yard dash per Goessling.
But come on. If someone timed Sinkfield at 4.19 seconds, that means someone had an itchy trigger finger on his stopwatch. Does anyone seriously believe that Sinkfield, who has no major track and field accomplishments beyond high school, is faster than Broncos return man Trindon Holliday, who won the NCAA 100-meter dash title?
According to Associated Press (via ESPN.com), the Cedar Rapids Gazette clocked Sinkfield at 4.32 and 4.30 after a video review at the Northern Iowa pro day that same year.
At 6'1", he isn't the small burner that many would expect to exude that kind of speed. Sinkfield takes long strides that chew up a lot of yards to help burn his defenders. It's that kind of explosiveness that helped Hamilton reach the Grey Cup, Canada's Super Bowl, in 2014.
NFL Draft Diamonds showed his speed:
NFL Draft Diamonds @DraftDiamonds
#Vikings here is the 40 of Terrell Sinkfield #UNI https://t.co/i0iaoQOZYY2016-1-22 18:48:50
While speed is important, Sinkfield also showed in the CFL that he has a set of reliable hands, having caught 69 passes in 15 games.
For a Minnesota Vikings team whose leading receiver was Stefon Diggs with 720 yards, wide receiver is a position that could use a bit of a lift this offseason. While Sinkfield isn't the kind of player that will completely overhaul the group, he should create competition for a third or fourth spot among receivers.
CFL stats courtesy of CFL.ca.