Mane has had a down year by his lofty standards. He has scored six goals from 19 Premier League games this season, compared to 11 at this time last term.
"Sadio trains at an extremely high level, to be honest. That's the only way and that's good. Everything will be fine," he told the club's website.
"It's normal to talk about Mo and Roberto, and it's also normal for people to sometimes overlook a player's contribution – but I don't oversee it.
"It's obvious they are in good form and good shape and have been for months.
"Sadio's effort would have been the most spectacular goal of the game [on Sunday] – he was, I think, six-foot high to shoot. It was unbelievable, an Olympic jump!
"It's all good; it's always that when players are more in focus, it's because they deliver by scoring or whatever and we need that. I only don't like it if we talk constantly about these players because you will always forget somebody, but that's the world."