Mane struck both goals for the 2-0 win on Sunday.
It was his second goal which grabbed the headlines, with Kepa - who commanded a world-record £72million fee for a goalkeeper in 2018 - criticised for his mistake.
And Mane told Sky Sports: “Yeah, sure, these kinds of things are always what we try on the training pitch.
“When he got the ball, I knew it will be difficult for him to have an option, the only choice was to shoot it.
“So I was in front of him and he tried to pass it. Unluckily for him, he made a mistake. Lucky for me and I scored a second goal for my team."
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