SANTA CLARA -- Ray McDonald has a right biceps tear that will likely require offseason surgery, but the 49ers defensive end said Tuesday that he expects to play against the Arizona Cardinals on Sunday.
"All my strength is functional, so I'll be able to play with it," McDonald said. "It should be fine. It just looks kind of funny, and I have to stay on top of my strength with it."
McDonald isn't sure how he will be impacted by the tear over the duration of the season, but he's hoping for the best.
"It's too early to tell," he said. "I'll know more as the week goes on when I start training, trying to lift on it and seeing what I can do with it. "
McDonald said he hasn't tried to test the arm yet, but plans on practicing Wednesday. The injury isn't bothering him off the field.
"I'm able to use it in my day-to-day life, so I guess that's a good sign," he said.
McDonald was impressed with the way Tony Jerod-Eddie filled in for him.