The Vikings may have to play Sunday's game against Green Bay without safety Jamarca Sanford (concussion) and center John Sullivan (concussion).  Both were absent from practice for a 2nd straight day.  Backup quarterback Joe Webb missed practice Thursday for non-injury related reasons.  If Sanford and Sullivan can't play Sunday Tyrell Johnson would start at safety and Joe Berger would start at center.

The following players were limited in practice Thursday; Receiver Percy Harvin (ribs), linebackers Kenny Onatolu (hamstring) and E.J. Henderson (knee), tackle Phil Loadholt (knee), and cornerback Antoine Winfield (neck).  Left guard Steve Hutchinson (knee) was a full participate in practice.  The Vikings host Green Bay at 3:15 Sunday, pregame on WJON at 2:00.