The England striker scored twice and grabbed an assist as the Red Devils swept past Bayer Leverkusen 4-2 on Tuesday night, enthusing after the game that he was delighted to have scored 200 goals for the club.
But when questioned on the 28-year-old's current state of mind, Moyes revealed that he does not know how his forward feels - only that he has looked sharp in training and during matches.
"I don't know," the United boss told ITV Sport. "I just know that he's been great in training, he's worked really hard, he's fit, he looks fit and lean and he showed in his performance [on Tuesday] again.
|MANCHESTER UNITED LATEST
|9/1||Wayne Rooney is 9/1 with Coral to score two or more goals against Manchester City
"I thought his goals [against Leverkusen] were great, he got round the goalkeeper and that could've been the hat-trick, obviously his second at the time, but he deserved the ovation that he got, his performance was terrific."
The 50-year-old also reserved praise for the partnership that Rooney is developing with fellow striker Robin van Persie - who also scored against the German outfit.
"I think they're both such good players - Robin's goal as well was great," Moyes added. "Robin could have had another one as well.
"I said a week or so ago if we could get those two scoring the goals and the ratio through the season then they'd be formidable and obviously it would help get us as many points as we can.
"It was a good night. We did a lot of good things, missed a couple of chances which kept it a little bit anxious at one or two moments but good job."