Keita opened his Liverpool account at Southampton last Friday and then set the Reds on course for a 2-0 Champions League win over FC Porto on Tuesday night at Anfield.
His fifth-minute breakthrough against the Portuguese side was the start of a hugely influential performance by the summer 2018 signing, who showed the range of his creative and defensive qualities.
But, according to Mane, there is still a lot more talent for his friend and teammate to express as he continues to settle at the club.
“It is going well for him and everyone is very happy,” Mane said of Keita.