The wantaway striker is still out of action due to a shoulder injury and will play no part against Wigan in Sunday's match at Wembley, with Ashley Young and Nani also sidelined
The 27-year-old has yet to feature for the Premier League champions in pre-season, and was banished to the reserves on Thursday as he angles for a move to Chelsea.
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"I am pleased about that [Rooney's call-up]. I had a long conversation with Roy [Hodgson, England manager] last week about it and told him Wayne’s situation," Moyes told the club's official website.
"Wayne has had a shoulder injury which has meant he has not been able to have any contact and it has been sore, so he hasn’t trained with us. He has trained a little bit with the reserves as a non-contact player, a floating player, so he has at least got a little bit of football work done.
"He trained with the first team on Saturday and did a bit of extra work [afterwards], so he is probably more likely to be ready for England than he will be for us.
"He hasn't had a lot of football practice which I explained to Roy and I would only expect Roy to play him for a short time.
"Hopefully Wayne is not in too good form because it would be good if Scotland could get a result!"
Moyes also confirmed that wingers Ashley Young and Nani will miss Sunday's trip to Wembley through injury, though Robin van Persie, Nemanja Vidic and Patrice Evra are expected to return to the side after United suffered defeat in Friday's friendly against Sevilla.