Following a controversial Facebook post in which Christos revealed how he'd been kicked off a radio program on Friday morning, he also described in the comments section how Wawrinka had aggressively approached Nick in the locker room.
"He (Wawrinka) put his hands on Nick," Christos Kyrgios wrote.
"(He) grabbed him and said a whole bunch of abusive shit. I've studied law and that shit is abuse bro. Lucky we aren't pressing charges."
Christos also defended his brother's on-court actions, saying he would have said worse to the French Open champion.
"The prick (Wawrinka) is lucky I wasn't there or he would have been withdrawing from the next few tournaments," Christos wrote.
Christos' initial crude Facebook post referred to a radio interview he was cut from, after he said the woman at the centre of the Kyrgios-Wawrinka stoush Donna Vekic "obviously loved the 'Kokk'".
The host of the Grill Team radio program Christos was kicked off was forced to cut the interview short.
"Sorry, we’ve just had to dump Christos. He said something pretty crook," Page said.
Before being cut off, Christos said the Nick's comments were a reaction to Wawrinka taunting him about feigning injury.
"If you’re going to come and openly... it's not even sledging, that's openly slandering someone after a match then I guess you can expect a bit of sledging back when you play them next," Christos said.