Stanislas Wawrinka has put the heat back on Australian Nick Kyrgios, accusing him of failing to properly apologise for his lewd outburst in Montreal.

Kyrgios made worldwide headlines last week after making offensive remarks about Wawrinka’s reported girlfriend, teenager Donna Vekic, during a match against Wawrinka.

The ATP is expected to announce later on Wednesday whether Kyrgios will face further sanction for his comment.

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World number five Wawrinka admitted the controversy was still on his mind after fighting back from a set down to defeat Croatia’s Borna Coric 3-6 7-6 (7-3) 6-3 in the second round of the Cincinnati Masters on Wednesday.

“We still talk a lot about it (the controversy) for sure, it’s quite fresh,” said the father of one.

Kyrgios, who was fined $US10,000 ($A13,600) by the ATP for his courtside sledge, later issued a statement apologising for his remarks, insisting they were made “in the heat of the moment.”

Kyrgios apologised on social media and to Wawrinka in the locker room after their match.

But Wawrinka said Kyrgios’s apology didn’t go far enough.

“He didn’t really apologise to the people. He should. That’s it. That simple,” Wawrinka said.

Wawrinka, who is divorcing his wife of more than decade, insisted however that the ugly controversy would not derail his preparations for the US Open.

“I know how myself, I know how I get ready for a grand slam. I know how I deal with everything. I’m sure I’m going to be ready for US Open,” said the double Grand Slam winner.

“It was really important to win this match today. It was not the way I played on the court but the way I fight with little energy that I have. That’s the most important.

“For sure I was struggling today to be completely on the court and to fight the way I wanted. It’s been some tough days for some people, and it’s always difficult to completely focus on the tennis court.”

Kyrgios triggered widespread criticism for his on-court taunt to Wawrinka that implied fellow Aussie Thanasi Kokkinakis had a fling with WTA professional Vekic.

Vekic, 19, finally made her own response after being dropped into the controversy.

“It’s not easy but I’m trying to focus on tennis and my next match,” she told The Province newspaper in Vancouver.

“I haven’t spoken to Kyrgios. But it’s a very disappointing thing to be happening in our sport and I hope it won’t happen again because it’s not a very good image for our sport.”