He joined Liverpool on a five-year contract earlier today.
The jet-heeled Senegalese forward has netted 24 goals in all competitions for Southampton following his switch from Red Bull Salzburg two years ago.
The 24-year-old represents an exciting signing for Liverpool and manager Jurgen Klopp has seen first hand just what he is capable of.
Back in March, Klopp's Liverpool went down 3-2 at Southampton in a game which saw Mane score twice - including an 86th-minute winner - as the Saints came from 2-0 down in a dramatic second-half showing at St Mary's.
Mane, who also missed a penalty, demonstrated his explosive pace and composure that day with two excellent finishes with his so-called weaker foot and maybe, just maybe, the German manager decided then that he wanted him on Merseyside.
That Mane jetted away from a defender as good as Mamadou Sakho for both goals will have only reinforced Klopp's desire to bring him to Liverpool.