The Reds forward is on top form, scoring and assisting against Fulham last weekend.
And Mane has 11 goals in 2019 as he joined up with the national side.
And footage has emerged of Mane’s reaction when some fans tried to get the 27-year-old to make a decision.
In the clip, the Liverpool ace has been training in front of a crowd.
As he walks up to say hello, he spots an odd sign.
A group of supporters hold up a banner calling on Koulibaly to join the Red Devils.
Mane’s antics come as:
And the forward makes his feelings very clear as he puts two thumbs down at the fans.
The crowd suddenly boos at the 26-year-old.
But Mane shakes his hands at them, putting his thumbs down again.
It is all light-hearted, though, as the forward walks away with a grin.
“Anfield legend. Statue imminent”
This footage was shared on Reddit yesterday.
And the Anfield faithful loved their forward showing his hatred of rivals United.
“F***ing love Sadio Mane,” one supporter said.
Another commented: “Glad they made him laugh.
“Koulibaly to United is a pretty good joke.”
While a third suggested giving the Senegalese star a huge honour.
“Anfield legend. Statue imminent,” they said.
And a fourth added: “You’re perfection.”
Mane could be joined at Liverpool by Juventus star Paulo Dybala, according to reports.