Cook -- who led the Spartans to a Big Ten title and the 2015 College Football Playoff -- played in one regular season game in 2016 for the Oakland Raiders, who drafted him in the 4th round of the 2016 NFL Draft. He was thrust into a starting role as a rookie for the team's Wild Card playoff game at Houston that season, completing just 18 of 45 passes for one touchdown and three interceptions.
The Lions have several options with Cook moving forward. They likely will not re-sign veteran Matt Cassel, who signed last a veteran-minimum one-year deal last offseason. Detroit can now choose between Cook and former University of Michigan quarterback Jake Rudock to play backup to starter Matthew Stafford.
Detroit got a good look at Cook over the summer during a preseason game with the Raiders, as well as a couple of joint practices. Cook was 11-for-19 passing with a touchdown and no interceptions in the preseason game at Oakland.