Chad Greenway, Jared Allen

FILE - In this Dec. 29, 2013 file photo, Minnesota Vikings outside linebacker Chad Greenway, left, laughs with teammate Jared Allen before an NFL football game against the Detroit Lions, in Minneapolis. The Minnesota Vikings have signed defensive end Jared Allen to a ceremonial one-day contract to allow the four-time All-Pro to formally retire as a member of the team. The Vikings made the announcement Thursday, April 14, 2016. (AP Photo/Ann Heisenfelt, File)