Fabio put in an impressive display at left-back for United, but was forced off in the dying minutes with an injury.
But Fergie insists it is not a serious injury.
“Fabio was absolutely outstanding today, the boy’s magnificent for 18 years of age,” he told Sky Sports.
“He’s first-class, he just had some cramp, he’ll be okay.
“I took Rio and Scholesy off mainly as a precaution.”
