The Vikings reportedly signed a quarterback on Thursday as they land former Chiefs QB Matt Cassell. ESPN is reporting Cassell signed a one-year, four-million dollar deal to back up starting quarterback Christian Ponder. Cassell was cut by the Chiefs on Thursday to make room for the recently acquired Alex Smith. The Vikings are also rumored to be wooing Green Bay free agent wide receiver Greg Jennings. The Vikings did sign two unrestricted free agents on Thursday as they inked center Joe Berger along with defensive back Jamarca Sanford.