He rapped: "There is one law for them and another for everyone else." Wiley missed a kick by William Gallas at Nani and then refused to take retrospective action after seeing a video replay.
Nani was also fouled more than once for alleged 'showboating'.
Ferguson added: "I haven't anything to say about Gallas. We kind of expected that.
"Justin Hoyte had a kick at Nani off the ball and their young left-back, Traore, had a terrible tackle on Nani as well.
"There could have been three or four red cards.
"The ref had a hard game in the second half. There were so many things happening."