Odsonne Edouard started on the bench on Saturday afternoon with the Frenchman nursing a toe injury.
Leigh Griffiths started the game with Neil Lennon reverting back to one up top with a winger either side.
Celtic were 1-0 up thanks to a Callum McGregor penalty in the first half.
It was the 63rd minute when Eddy would be introduced to the game and his first touch of the ball two minutes later had the Ross County goalkeeper picking the ball out the back of his net.
🍀 🇮🇪 Celtic 2-0 Ross County 🇮🇪 🍀
Super Sub French Eddy 👏 👏 👏 pic.twitter.com/WhcIDxxte8
— Parkhead Tims (@ParkheadT) January 25, 2020
Edouard wasn’t done being the ultimate impact substitute when a couple of minutes later he scored his second.
🍀 🇮🇪 Celtic 3-0 Ross County 🇮🇪 🍀
French Eddy (2) 👏 👏 👏 pic.twitter.com/xiCr4AJTvY
— Parkhead Tims (@ParkheadT) January 25, 2020
Celtic were comfortable at 3-0 and Eddy would have had an assist another few minutes later but Mikey Johnston chose to square the ball instead of shooting.
An absolute game changer.