A disjointed Hoops side had no answer to the Highlanders’ spirited defensive display as a first-half penalty from Ross Stewart and a header from Alex Lacovitti from a corner late in the second half sealed a famous win for Stuart Kettlewell’s men.
The home side's defeat – Celtic’s first in a domestic cup competition for 35 matches – extends a poor recent run of form for the Parkhead side both at home and in Europe and leaves the position of manager Neil Lennon hanging by a thread.
Here's how the Celtic players rated in an abject performance.
Player ratings scale - 10: One of best performances you've seen. 9: Outstanding. 8: Very good. 7: Good. 6: Average. 5: Poor, 4: Very poor. 3: Terrible day at office. 2: Abysmal. 1: One of worst performances you've seen.
1. Vasilis Barkas - 5
The Greek international was restored to the number one position after seven matches on the sidelines but didn't command his box at either goal and dived the wrong way for the penalty. Photo: Alan Harvey - SNS Group
2. Hatem Elhamed - 5
Deployed at right-wing back to provide the team with width and crosses. Did neither as he continually cut inside into dead ends. Photo: Rob Casey - SNS Group
3. Christopher Jullien - 4
Clumsy challenge on Ross Stewart to concede penalty then posted missing - along with the rest of the defence - for County's second. Unsteady performance. Photo: Craig Foy - SNS Group
4. Nir Bitton - 5
Usual laid back performance when the situation demanded more. Too happy to pass the buck to Brown to build play rather than stepping out from defence. Photo: Craig Foy - SNS Group