San Francisco 49ers safety Michael Lewis waves after intercepting a pass in the end zone from Chicago Bears quarterback Jay Cutler on the last play of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers defeated the Bears 10-6. (AP Photo/Paul Sakuma)

Chicago Bears quarterback Jay Cutler reacts after throwing an incomplete pass in the fourth quarter of an NFL football game against the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. The 49ers won 10-6. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jay Cutler reacts after being hit by the San Francisco 49ers in the fourth quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers won 10-6. (AP Photo/Marcio Jose Sanchez)

Chicago Bears tight end Greg Olsen misses a catch in the end zone in front of San Francisco 49ers safety Michael Lewis (32) in the last minute of the NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers won 10-6. (AP Photo/Paul Sakuma)

San Francisco 49ers safety Michael Lewis (32) intercepts a pass by Chicago Bears quarterback Jay Cutler in the end zone in the fourth quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers won 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Alex Smith sets to throw a pass in the third quarter of an NFL football game against the Chicago Bears in San Francisco, Thursday, Nov. 12, 2009. The 49ers defeated the Bears 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers linebacker Patrick Willis (52) tackles Chicago Bears running back Matt Forte (22) in the third quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers won, 10-6. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis (85) runs over Chicago Bears linebacker Nick Roach during the first quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Paul Sakuma)

Chicago Bears linebacker Nick Roach (53) and safety Josh Bullocks (36) tackle San Francisco 49ers running back Frank Gore during the first quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Jeff Chiu)

San Francisco 49ers' Frank Gore (21) before an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Cherleaders before an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers guard Tony Wragge (69) and tight end Delanie Walker (46) are introduced during an NFL football game against the Chicago Bears in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Fans cheer before an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) jumps over a Chicago Bears player in the first quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Paul Sakuma)

San Francisco 49ers quarterback Alex Smith (11) is sacked by Chicago Bears defensive tackle Marcus Harrison (94) as defensive tackle Anthony Adams (95) follows in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Chicago Bears cornerback Zack Bowman (35) intercepts a pass intended for San Francisco 49ers wide receiver Michael Crabtree (15) in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jay Cutler against San Francisco 49ers an NFL football game, in San Francisco, Thursday, Nov. 12, 2009.(AP Photo/Paul Sakuma)

Chicago Bears quarterback Jay Cutler against San Francisco 49ers an NFL football game, in San Francisco, Thursday, Nov. 12, 2009.(AP Photo/Paul Sakuma)

Chicago Bears' Zack Bowman (35) tackles San Francisco 49ers' Michael Crabtree (15) in the first quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers' Patrick Willis (52) tackles Chicago Bears' Matt Forte (22) in the first quarter of an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers' Michael Crabtree (15) in the first quarter of an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers cornerback Tarell Brown (25) is pushed out of bounds by Chicago Bears quarterback Jay Cutler (6) after Brown intercepted a Cutler pass in the second quarter, setting up a 49ers touchdown in an NFL football game, in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Paul Sakuma)

Musician Chris Isaak performs during halftime of an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) scores a touchdown against the Chicago Bears in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Paul Sakuma)

Chicago Bears tight end Greg Olsen (82) is tackled by San Francisco 49ers safety Mark Roman (26) in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers' Frank Gore (21) runs in the first quarter of an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Chicago Bears' Danieal Manning (38) in action during the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) scores a touchdown against the Chicago Bears in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009.(AP Photo/Paul Sakuma)

Former San Francisco 49ers quarterback Steve Bono shows his Super Bowl ring before an NFL football game between the Chicago Bears and the San Francisco 49ers in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Jeff Chiu)

Cheerleaders perform during the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Cheerleaders perform during an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Chicago Bears' Greg Olsen (82) is tackled by San Francisco 49ers' Dashon Goldson (38) in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis (85) against Chicago Bears in an NFL football game, in San Francisco, Thursday, Nov. 12, 2009.(AP Photo/Paul Sakuma)

Chicago Bears running back Matt Forte (22) runs from San Francisco 49ers linebacker Manny Lawson (99) in the third quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

Chicago Bears head coach Lovie Smith watches as the Bears play the San Francisco 49ers in the second quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers coach Mike Singletary yells on the sidelines during the third quarter of an NFL football game against the Chicago Bears in San Francisco, Thursday, Nov. 12, 2009. (AP Photo/Paul Sakuma)

Chicago Bears wide receiver Earl Bennett (80) pushes off San Francisco 49ers safety Michael Lewis (32) as he runs after a reception in the third quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. Also pictured at rear are San Francisco 49ers linebackers Patrick Willis (52) and Matt Wilhelm (57). (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) fumbles as he is tackled by Chicago Bears cornerback Charles Tillman (33) in the fourth quarter of an NFL football game in San Francisco, Thursday, Nov. 12, 2009. The 49ers recovered the fumble. (AP Photo/Marcio Jose Sanchez)