The infection, known as the 'adult chickenpox', can take FOUR WEEKS to clear.
That puts the defender in danger of missing United's last-16 Champions League clash at the Bernabeu next Wednesday - AND the return at Old Trafford on March 5.
Jones pulled out of tonight's England Under-21 friendly with Sweden.
Young Lions boss Stuart Pearce said: "It's a shame. You want your good players to be here.
"But Phil has picked up shingles and there's not a lot we can do about it.
"But it means someone else gets a chance."