"I think Juan has been doing really well for us," he said. "He's made the team better, he can assist and score goals. In his first four or five games we didn't see him scoring any, but now you're beginning to feel that he's got goals in him. His backheel for the the fourth goal was a piece of magic, it was great. I thought when Shinji, Juan and Adnan were on the field, there were some technically gifted footballers out there.
"His composure for the second goal was great, having been played in by Hernandez, as well as the free-kick. Every day, him and Wayne Rooney practice their free-kicks and try to get them right, it's a simple thing but practice makes perfect. It was a perfect free-kick today.
"It was good [to see Hernandez and Januzaj score]. Javier went through and hit the post just before half-time, before we scored an important goal to make it 2-0. It was a great piece of movement and a great bit of play to get in again, with Javier's movement in the box, and everyone knows that's what he can do."
The only downside to come out of the match was Ashley Young's injury. The winger was forced off in the first half with a hand problem and later went to hospital.
"He has torn ligaments in his hand and it looks like a bad injury," Moyes said. "I don't know how long it will keep him out for at the minute, but from what the medical team have told me, it doesn't look good."
More: Match Report