The Football Association has sought observations from Wolves after their manager Nuno Espirito Santo slammed referee Lee Mason after their defeat at Burnley on Monday night.
Nuno questioned Mason's fitness to take charge of a Premier League fixture, saying he 'clearly doesn't have the quality' and 'cannot control the players.'
He also said he hoped Mason doesn't ever take charge of a Wolves fixture again in stinging comments broadcast on Sky Sports.
The FA have now asked the Molineux club for their observations on Nuno's comment and it's possible the Portuguese manager could face disciplinary action.
Wolves lost 2-1 at Turf Moor and Nuno said afterwards: 'The referee does not have the quality to whistle a game in the Premier League.
'This is a problem that we knew - we had Lee Mason before.
'It is not about the crucial mistakes or decisions, it is about the way he handles the game.
'The players get nervous, too much voices, he whistles by the voices when some players are shouting.
'We are talking about the best competition and clearly he doesn't have the quality to whistle the game. I'm very disappointed to say this but I would not feel right if I didn't say it.
'I just don't want to see him more - that's what I told him. I hope he doesn't whistle a game of ours again because all the games we have with Lee Mason are always the same.
'He cannot control the players, the players are constantly arguing - both teams. With all the other referees the game flows, there's dialogue. He's just not ready to do it.'