The 28-year-old made his first appearance for the Red Devils since April following a series of fitness problems.
"I feel ready," Young told MUTV. "I didn't have a full pre-season but I have been trying to get myself fit all summer and when I'm fully fit, when called upon, I will go out there and give 110%.
"I had a stop-start season last year with the injuries I had, which was frustrating, but I was glad to get back out on the pitch and to get some minutes. I felt good out there and, fingers crossed, now I won't have the same injury problems this season."
United return to action on Sunday when they travel to Liverpool in the Premier League.