A return to Lambeau Field appears imminent for free agent Matt Flynn after the shoulder injury sustained by Packers quarterback Aaron Rodgers.  With Seneca Wallace as the only backup signal caller on Green Bay's roster, Flynn is likely to be signed this week pending the results of Rodgers' medical tests on Tuesday.

ARTICLE: Matt Flynn UPDATE (11/6/13)

Rodgers' injury, to his left non-throwing shoulder, happened in the opening series on Monday when he was sacked by Bears defensive end Shea McClellin; Rodgers exited the game and didn't return.  The Pro Bowl quarterback will undergo further testing on Tuesday to determine the extent of the injury, ESPN reports.

"It doesn't look good," a Packers source told ESPN's Ed Werder on Tuesday.  "This is the one we couldn't afford to lose."

Based on early indications, Rodgers' injury doesn't appear to be season-ending.  The testing will determine how long Rodgers is sidelined.  ESPN's Adam Schefter reported the initial tests suggest Rodgers could miss about three weeks.

"More definitive scans today but initial tests showed small fracture in Aaron Rodgers' collarbone that could sideline him about three weeks," Schefter tweeted on Tuesday.

The timing couldn't be better for Flynn.  The Buffalo Bills released the 28-year-old on Monday, hours before Rodgers' shoulder injury. 

With Green Bay right in the thick of the NFC North and tied for first with Detroit and Chicago, the Packers can't afford to drop any games - even if Rodgers does miss only three weeks.

Flynn knows coach Mike McCarthy's system, and the signal caller may offer Green Bay a better chance to win than Wallace.  Even if McCarthy opts for Wallace, the Packers still need to add depth at the quarterback position.

The opportunity to start would be an incentive for Flynn to take a minimum salary contract; playing again would let him audition for other teams after failing to impress in Seattle, Oakland and Buffalo.