Serial moaner Ferguson ripped into Wiley after United's 2-2 draw with Sunderland at the start of October, claiming the result had been due to the ref's inability to keep up with the action.
Fergie took exception to Wiley spending nearly six minutes over a booking, making several decisions using binoculars and asking a fan behind the goal whether a late Patrice Evra effort had been deflected or not.
The criticism hit a sore spot for Wiley, who is fiercely committed to maintaining a high level of fitness, and he considered taking legal action. But it has now been confirmed that there will be no defamation suit as Wiley didn't send in the necessary paperwork.
"I had it all filled out and ready to go off but my car was being repaired in the garage," a breathless Wiley explained.
"I went all the way down to the main road but there wasn't a post box there. I think there's one down by the station but that's miles away. I guess the big managers are untouchable these days."