van Persie's effort in the 1-0 victory at Sunderland last weekend did end up in the back of the net but not before it took a deflection off Black Cats defender Titus Bramble.
"The goals will come. All strikers have little dry spells - you always hope it ends quickly. It's just part of being a striker," he told reporters.
"It's disappointing he wasn't awarded the goal at Sunderland - I can understand that because it took a wicked deflection. His shot was fantastic - it was hit with such venom that it's not surprising it took a deflection."
He added: "It's just being sensible and realistic. Robin's shot last week could have come off any defender because it was hit so well and that's the right thing to do."