Moyes said: "It is four points from the last two games but I think it is obvious we are not firing on all cylinders and are missing players who are important to us.
"We are struggling a bit for our form but we've just got to keep moving on and picking up points. It is the injuries, not the long campaign, which are taking their toll.
"It is more to do with the three to four people we are missing. We are very limited in what we have available in forward areas and in midfield we are nearly drained of resources.
"You can have as many players as you like but you always need your best players in the team and we are missing too many of them at the moment.