The injury occurred in the 14th minute after an accidental collision and Jones was stretchered off to be replaced by Paul Warwick.
He was immediately removed to hospital where he remained overnight.
A statement issued today by Munster Rugby read:
Following on from the injury he sustained on Saturday against Connacht Felix Jones will be out of action for the immediate future. The full back damaged neck ligaments as a result of an accidental collision early in the game. He was immediately removed to hospital for examination and will remain there for contining observation for a number of days.
Guinness PRO12
Suite 208, Alexandra House,
The Sweepstakes
Ballsbridge, Dublin 4, Ireland