I think some people are a little too optimistic. If we end up selling Mane then this is not going to be a good window. So far we've replaced excellent players with good ones. Let's not replace a potentially world class player with more decent, but only decent, signings. If we hold on to Mane then I will be reassured that our long term plan is indeed a plan and not just reactionary knee-jerking. Mane can go next summer - as most likely planned- with well though out replacements coming straight in. Not now. If we need to do a Scneiderlin again, then so be it.
As a couple of other people have said, football is an entertainment business and Mane is currently our most entertaining product. Selling him would be a real slap in the face to Saints customers. Anyway, I don't think we'll sell - but if we did it cannot be spun as a positive.