Mohamed Salah and Jurgen Klopp blanked each other after the final whistle in newly emerged footage.
The pair were involved in a heated bust-up on the touchline as Salah was about to come on for Liverpool with just 12 minutes to go.
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It is unclear what was said between them, but the spat quickly went viral.
New video from after the final whistle shows the pair completely blank each other at the London Stadium, following their 2-2 draw with West Ham.
Klopp appears to see Salah heading his way and then changes his direction to avoid the Liverpool star.
Neither appear to acknowledge each other.
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The result further dented their Premier League title hopes and all does not seem well in the Liverpool camp.
When asked about the incident after the final whistle, Klopp said: "No [I can't say what was said], but we spoke about it already in the dressing room. For me, it's done."
However, when walking through the mixed zone, Salah told reporters: "If I speak, there will be fire."
Klopp had made five changes from Wednesday's 2-0 defeat at Everton, which included dropping Salah and Darwin Nunez.
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A drab opening 45 followed in east London until Jarrod Bowen headed home a cross by Mohammed Kudus after Liverpool switched off from a short corner.
Whatever the German said at the break worked as the Reds emerged fired up and levelled within three minutes of the second half when good play by Luis Diaz teed up Robertson, who dug out a shot that Alphonse Areola could only push in via the post.
The turnaround was complete after 65 minutes when Cody Gakpo's scuffed effort deflected off Angelo Ogbonna and Tomas Soucek hit his clearance against the unfortunate Areola before the ball rolled into the back of the net.
Liverpool had chances to put the match to bed, but it proved a familiar tale as they conceded an equaliser when Antonio headed in from a Bowen cross to ensure the points were shared.