The Ducks were at Lawry's in Beverly Hills for a pre-Rose Bowl game tradition known as the Beef Bowl.
Offensive lineman Mark Asper saw Paul Diamond choking on some meat and jumped into action, performing the Heimlich maneuver.
Diamond said it wasn't that big of a deal, but Asper said it was clear he was struggling.
"I popped it out, and he came up to be afterwards and said, 'Hey man, thanks a lot, but you broke my sunglasses,' and I said, 'I'm sorry. I'll see if I can get you a new pair,'" Asper said.
Asper said he learned the Heimlich maneuver when he was Boy Scout at 12 years old.
Oregon's opponent in the Rose Bowl, Wisconsin, visits Lawry's Thursday night.