Mannion signed with Minnesota's practice squad Wednesday, Craig Peters of the Vikings' official site reports.
EDGE Analysis
Mannion joins the organization after the Vikings placed fellow quarterback Nick Mullens' (back) on injured reserve earlier Wednesday. The Vikings still have Kirk Cousins and rookie fifth-round draft pick Jaren Hall on the 53-man roster, but it's possible that Mannion could be elevated from the practice squad to supplant Hall as the top backup.