Rooney scored in both of England's recent international matches, against Montenegro and Poland, helping to secure his country's qualification for the World Cup finals in Brazil next summer.
That is a continuation of his strong performances for United so far in 2013/14, in which he has scored five goals and already edged past the 200-goal mark for the club.
At 27, Rooney is at his physical peak and so his form is to be expected, according to Moyes. "I think he's at the age in his career where he would be one of the main players and he's certainly a main player for Manchester United and England," he told reporters at his pre-match press conference on Friday.
"From that point of view, it's what you'd expect," he added. "He takes responsibility, scores the goals that are required and he's done that from a young age. The age he is now, he's got that maturity and it shows in how he plays and the condition he is in with the way he is playing for club and country.
"I saw Wayne on that first day of pre-season and yet you people [the press] were telling me you felt differently. I saw him in great form and great fettle, training fantastic from day one, but you want to say different things."