Bollinger to start?

With starting quarterback Tarvaris Jackson recovering from a concussion, Brooks Bollinger appears to be in line to get his first start with the Vikings in Sunday's game at Green Bay.

Coach Brad Childress said today that Jackson passed four of five parts of an impact test but that his status is still day-to-day.

With veteran backup Kelly Holcomb still recovering from a neck injury, Childress said the Vikings will be bringing in some quarterbacks for workouts this week.

Childress declined to name names, but Drew Henson, who was in training camp with the team, is one possible candidate.

Today is a day off for the players so there's a good chance Jackson and Bollinger won't be available for comment during this afternoon's open locker-room period.

Childress said Jackson would undergo an exercise test Wednesday but was uncertain when he might practice.

"He bounced in here with a smile on his face today. No headaches," Childress said. "He said, 'I'm Donovan (McNabb).'"

That drew some laughter from the assembled media, but Childress said Jackson actually said it.

"So I think he's in good spirits," Childress said. "But just because a guy's got a sense of humor, I don't think that's one of the criteria (for playing)."

Note: Childress said wide receiver Troy Williamson is due to return to practice Wednesday after his grandmother's funeral and that his role for Sunday has yet to be determined.