ORCHARD PARK, N.Y. — Running back C.J. Spiller is expected to play for the Buffalo Bills in Sunday’s game against the Oakland Raiders, but how much work he can handle will be determined as the week progresses.

Spiller has been on the injured reserve/designated to return list since breaking his collarbone Oct. 19 against the Minnesota Vikings. He missed seven games, but was medically cleared to play after practicing the past couple weeks and is expected to be activated to the 53-man roster by Friday.

The Bills released fullback Frank Summers, who has been inactive the last four weeks.

Spiller said he felt good after practicing on Wednesday, even though he didn’t participate fully.

“We’ll see how I feel when I come in (Thursday),” he said. “Hopefully it’s a good sign and if it is I’ll keep plugging away and go from there.”

Spiller still has not been exposed to real contact since suffering the injury, and that remains a concern, as is his conditioning.

“Once you get that first lick in you’re ready to play ball, and I don’t think it’ll be any different,” he said. “I’m pretty sure if I’m able to go they’re going to take a shot at it and we’ll see how I do. Conditioning will be different because I haven’t played in two months so I won’t be in top-notch football shape, but I think if I’m able to go, I can perform at a high level. I don’t want to get into percentages, but if I’m able to go then I’ll go. We’ll see how these next couple days go and see how I respond every day after practice and then make a decision.”