The Reds forward is on top form, scoring and assisting against Fulham last weekend.
That meant the Senegalese star has scored four goals in his last three games, two against Bayern Munich in the Champions League.
And Mane has 11 goals in 2019 as he joined up with the national side.
This sees him play alongside Napoli defender Kalidou Koulibaly, who has been linked with rivals United.
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.
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” Liverpool fan.
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.”