The 31-year-old has never before appeared for his country in a competitive competition, only making his international debut the Three Lions' November friendly against Sweden.
Moyes feels that the Toffees midfielder has been the key to his side's success in the Premier League this campaign, noting the sizable burden that he has carried.
|7/1||Leon Osman is 7/1 with William Hill to score the last goal in San Marino v England
"Yes, at times he has dipped under his best, like all players will do, but so far this season he has been very good."
The 49-year-old praised Osman's attitude, the midfielder having assumed a wide range of roles for Everton over the course of the campaign.
"His performances have been excellent and he really has carried us at times," Moyes enthused. " Whatever we've asked him to do - we've asked him to do different jobs at times - he's done it, he's come up with some important goals and he's had his best season at Everton for me.
"He's been exceptional and I'm delighted he's been given another call-up by England."