EAST RUTHERFORD, N.J. (AP) -- Tom Coughlin doesn't have many options at halfback for the winless New York Giants.
The choice now is rookie Michael Cox, and that's it.
Veteran Brandon Jacobs, who ignited the running game for the first time this season in a 27-21 loss to the Chicago Bears on Thursday night, has a tweaked left hamstring.
He did not practice on Monday as the Giants (0-6) started work for next Monday night's game against the Minnesota Vikings.
Jacobs insists he will play. Cox said he is ready. David Wilson and Da'Rel Scott are major question marks.
Wilson, the No. 1 back to start the season, had his troublesome neck injury examined by a spine specialist in California on Monday. He was hurt late in the first quarter against Philadelphia a little more than a week ago.
A source with knowledge of the results told The Associated Press that Dr. Robert Watkins confirmed that Wilson has a herniated disc and stenosis. Stenosis is a narrowing of the spinal column.
Wilson will continue to receive treatment and will be evaluated in a few weeks, the source said, adding the injury is serious and the team is going to proceed slowly.
Scott also injured his hamstring against the Bears and appears to be out for Minnesota.
Things were so bad before last week that backup linebacker Allen Bradford ran a few plays as a halfback with the scout team.
Coughlin joked Monday when asked if he was concerned about his halfback situation.
"What do you mean?" he said. "We had one. We're all set."
Besides Cox, Coughlin also has fullback John Conner in the backfield.
Sitting in front of his locker, Jacobs smiled when asked about his hamstring, which was hurt on a night he carried 22 times for 106 yards.
It was the first individual 100-yard rushing effort by a Giant this season, and Jacobs' first 100-yard game since 2010. It came on a night New York ran for a season-high 123 yards.
"I'm not missing any game," Jacobs said. "Straight up, that's all there is in a nutshell. I am not counting on being down."
Jacobs said the trainers advised him not to practice Monday and he has been told his injury is day to day.
The 31-year-old Jacobs surprised a lot of people with his performance. He ran hard. He had great second effort. He also showed he could get into the end zone, twice carrying Bears' defenders there.
"It's not about proving to everybody," said Jacobs, who barely played after signing with San Francisco as a free agent last season.
"I don't care to prove to anybody. All I need to do is show the guys in this locker room and the coaching staff what I have to do."
On the other hand, Cox has to prove himself. The seventh-round draft pick is still trying to learn the offense.