Detroit Lions quarterback Matthew Stafford was knocked out of the season opener when Chicago's Julius Peppers sacked him Sunday, putting him on the sideline with a banged-up right shoulder-his third injury in two seasons. 

Stafford's father, John Stafford, said his son is going to visit well-known sports Dr. James Andrews this week. 

Initial reports were that the injury was a second-degree shoulder separation. Stafford could miss anywhere from four to four weeks, causing for him to get a second opinion. Stafford's throwing arm did not appear in a sling which is a great sign, and there is no timetable for his return. 

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