Moyes said that the pair would bring much-needed enthusiasm to his defence, but wants his side to perform well against Newcastle United at the weekend even if they do not play.
"We have got Evans and Smalling back in training," Moyes told BBC Sport. "They are on the way back and we have missed them. We want their youth and enthusiasm.
"We have to go to Newcastle and put on a good performance, get the three points and gain some momentum."
United are currently seventh in the Premier League.