The accusations first surfaced back in September on popular fan site 'Down At The Mac' before re-appearing in a new thread earlier this week .
Users on the forum, who claim to be 'in the know' and close to the club, allege the pair had a run-in on the day of the West Ham United encounter – Monday, September 11.
Some then go on to cite the longer than expected recovery of Mounié from a heel injury and Smith's own recent omission from the side being down to the altercation.
However, when asked about it during this afternoon's pre-match press conference ahead of the weekend clash against Manchester City , the 25-year-old Smith was shocked and surprised about the accusation.
He said: “Absolutely not, absolutely not – categorically nothing has happened and Steve is a great lad and I get on well with him.
“I'd be happy to see where this rumour has come from because it's categorically false.”
Watch the video above for the captain's full reaction to the question during this afternoon's pre-match press conference at PPG Canalside.
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