Colin Kaepernick struggled again in Week 4 and was on the receiving end of trashtalk from Clay Matthews.

"You ain't Russell Wilson, bro," said Matthews during the fourth quarter to Kaepernick.

Matthews also sacked Kaepernick in the third quarter and mocked his trademark bicep-kissing celebration.

Matthews said after the game that the celebration was all in fun.

"Nah, it's not planned," Matthews said. "I was going to hit him with the predator, and then I had a light bulb go off in my head. It's just having fun. We're a bunch of kids out there running around and having fun at each other's expense."