Case Keenum led three second-half scoring drives after Sam Bradford's troublesome left knee flared up again, and the Minnesota Vikings beat Trubisky and the Chicago Bears 20-17 on Monday night.
Kai Forbath kicked a 26-yard field goal in the closing seconds after Harrison Smith intercepted Trubisky , and the Vikings (3-2) came away with the win after dropping two of three.
Trubisky was 12 of 25 for 128 yards with a touchdown.
The interception came after the Bears (1-4) took over on their 10 with 2:32 left in the game. Smith picked off a pass intended for Zach Miller on the right sideline at the 22.
The Vikings got the ball at the 28, and Forbath booted the winner with 16 seconds left.
Keenum replaced Bradford with 25 seconds left in the first half and went 17 of 21 for 140 yards and a touchdown. Bradford finished just 5 of 11 passes for 36 yards and was sacked four times.
Jerick McKinnon had a 58-yard touchdown run. Everson Griffen contributed a strip-sack against Trubisky that led to a field goal, and the Vikings beat Chicago on the road for just the third time in 17 games.
The Bears visit Baltimore on Oct. 15.