The Vikings signed Sorensen on Saturday, the team's official site reports.
A seventh round pick of the Chargers in the 2013 NFL Draft, Sorensen has been a mainstay of the practice squad for the bulk of his career. With Taylor Heinicke (ankle) on the pine for the foreseeable future, Sorenson will compete with undrafted rookie Joel Stave for the third-string role under center in Minnesota.