Kyle Walker vowed to knock out Neal Maupay during Manchester City's 3-1 win over Brentford on Monday night, a lip reader has claimed.
Pep Guardiola's side fell behind when Maupay opened the scoring in the 21st minute.
However, a hat-trick from Phil Foden turned the game around as City continued their hunt for a fourth straight Premier League title.
Towards the end of the contest at the Gtech Community Stadium, in the 81st minute, tempers flared.
Kyle Walker and Neal Maupay had heated words as Man City beat Brentford
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Walker, who had been taunted by Brentford fans all night following his split from wife Annie Kilner, was seen complaining to referee Jarred Gillett.
The England international also pointed and gestured in Maupay's direction with an angry expression on his face.
Walker seemed to be suggesting Maupay had made comments about his children after his fling with Lauryn Goodman.
And expert witness and forensic lip reader Jeremy Freeman, speaking to the Daily Mail, has now examined the footage and provided his verdict.
Walker, while addressing Gillett, apparently said: "Ref he spoke about my kids, he spoke about my kids, not once, but twice."
Maupay then said: "I didn't, it's OK."
Gillett tried to defuse the situation but the row continued, with Maupay continuing to protest his innocence.
"That's a lie, that's not fair, I promise you now," Freeman believes the Brentford striker said.
And he also believes Walker threatened to knock Maupay out by saying: "I'm gonna knock him [Maupay] out."
Fourth official Stuart Attwell told the City star to 'shush' and Walker had the last laugh, with his side picking up all three points as they closed the gap on rivals Arsenal and Liverpool.
Walker split with wife Annie last month after fathering two children with Lauryn.
And in a recent interview with The Sun, the 33-year-old took responsibility for his actions and apologised for his behaviour.
“What I’ve done is horrible and I take full responsibility," said the 33-year-old.
“I made idiot choices and idiot decisions. I can’t begin to think or imagine what Annie is going through. I’ve tried to ask her but there’s pain and hurt.
“The man that’s meant to love, care and be there for her, did this.
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Kyle Walker had the last laugh as Man City beat Brentford in their Premier League clash
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“There have been days in this ordeal where I’ve just wanted to curl up in a ball and go to sleep.
“The only person to blame is me. I have roles and responsibilities that I’m aware of and I’ve made stupid choices. But I need to own up to my mistakes — I owe it to everyone.
“My actions have caused a lot of pain to a lot of people. I’m sorry because, as a family, this isn’t meant to happen.”
He then added: “When I met Annie at 17, I never envisaged my private life being like this. I never thought I would be a father of six.
“In football I’ve achieved more than what I ever thought I would achieve. But to personally hurt what I truly believe is my best friend, that’s what hurts a lot.
Kyle Walker has admitted he's heartbroken following his split with wife Annie Kilner
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“How could I hurt someone I love so much? That’s something I need to find in myself.
“I need to find out why I have done this and why situations have occurred. I am human and I’ve made mistakes on and off the field.
“The ones off the field are definitely more damaging and have been more hurtful to me.
“Football has been my life since I was six but my family comes before anything on this planet. At the moment, they’re hurting enormously.”