Van Graan come off the bench and with his first touch of the game gave Ajax the lead late in the second half before United equalised.
"I'm still very excited and asking myself if this really happened, I'm pinching myself now. It’s the best feeling ever to score against Manchester United."
The former Milano United striker believes that this could do wonders in boosting his confidence ahead of the new season.
"Now I am looking forward to the season that's coming up especially after scoring in today’s friendly. I hope that the confidence and self belief stays for the rest of the season," he adds.