In his first interview since standing down in May, Sir Alex Ferguson claimed earlier this week United would be fine as long as Vidic stayed fit.
The Serbian has been a towering presence in defence this term and seems certain to keep his place for the Manchester derby at the Etihad Stadium.
Yet his contract expires in the summer and whilst there was speculation in his homeland earlier in the summer that a new deal was about to be signed, so far it hasn't happened.
Moyes admitted he had not spoken to Red Devils executive vice-chairman Ed Woodward about extending Vidic's stay at Old Trafford, which will reach eight years in January.
But providing his fitness holds up, he doesn't envisage a problem.
"It is something I have not discussed with the chief executive yet but Vida's form at the moment would suggest he is well worthy of that," said Moyes.
"Probably his injuries have been the reason why you might have to look at it, so the big thing is to see how he goes.
"But his form has been very good. We just need to hope he gets through and doesn't pick up any more injuries."
Vidic has been troubled by a major knee injury sustained during a Champions League defeat to Basle in December 2011 that required a second operation when the 31-year-old experienced discomfort as he attempted a comeback.