Edelman posted a Boston-themed clip to his social media accounts on Wednesday. He wrote "Beat LA" as the caption.
"This ability to perform under dire situations," Celtics coaching legend Red Auerbach says in the clip. "In other words, what does he do in the clutch? What has he won?"
Edelman is also selling "Beat L.A." shirts on his official website.
The Patriots and Chargers face off at 1:05 p.m. on Sunday at Gillette Stadium in Foxborough, Mass. with a trip to the AFC Championship on the line. New England leads the all-time series 24-15-2. The Chargers haven't defeated the Patriots since 2008.