The Senegalese attacker is in the form of his life for Liverpool, while they are set to do battle with the Saints.
And Bertrand is relishing a chance to test his qualities against a winger of Mane's caliber.
"He isn't showing any signs of slowing down. I am thoroughly looking forward to it," said Bertrand to reporters ahead of the clash.
"I've been really impressed with him, I think he has been their main player.
"I'm sure the other attackers have still produced some fantastic numbers in terms of goals, but I think he has been the one that shines."