The Reds were on course for a third win out of three in our former midfielder's time in charge, thanks to goals by Casemiro and Matheus Cunha.
However, the visitors scored a quickfire double to stun Old Trafford, as Raul Jimenez converted a penalty and Kevin hammered a terrific drive past Senne Lammens.
Dejection turned to elation, though, when Benjamin Sesko swivelled to fire in a cross by skipper Bruno Fernandes to make it 3-2.
After the game, Carrick had this to say to Sky Sports and MUTV...
WE KNEW IT'D BE TOUGH
"I've said it before the City game, I think this is a special place and it does special things.