Both star strikers missed Sunday's FA Cup defeat to Swansea City but, reluctant to complain about the absence of the free-scoring pair, Moyes was philosophical.
When asked about the injury situation, the manager replied: "We actually thought at the start of the season that it was the best we’d ever seen, we had most players available.
"Injuries are part of football and there’s very little we can do about most of them. I think they're down to the large number of games we play as well.
"Robin’s been out with a sore groin; he played really well against Arsenal and scored the winner. We gave him a week’s holiday to recover - he didn’t go away with Holland – he came back and hasn’t really been right since. He played one game against Newcastle and, the next game, he pulled his thigh taking a corner.
"Wayne's struggling now. He’s had it for three or four weeks and played through. We left him out for a game or two to try to recover it, but he’s now beginning to feel it a bit more and we have to be careful not to turn it into something worse.
"A week off might be enough or he might need a bit more than that – I think it’s the sort of thing that a couple of weeks might fix."