Mane was originally on our right and did well there pre-Salah but I can't remember him being tried or having a good game there since. And as others have said, he has been so good centrally that I would be loathe to disrupt the team further by moving him.
AOC or Elliott would probably be our best bet, but that would be a massive call from Klopp.
Another thing is, if it was a usual season with a 3 month summer break you might take a chance on Salah in the final, but if he ends up with a bad tear it could disrupt the start of next season which KOs barely 2 months later. Any serious muscle injury would rule him out of preseason.