It's heck of a jump from the £2.3m you first mentioned to the £3.5m in this 2nd post! I agree there might be additional income, but I would have thought unlikely to be another 50% on top of a £15k per week salary.
I agree that £1.75m might be enough to live on IF a) you come out of the 3 years in London with nearly all of it intact, and b) you invest sensibly. 2 very big ifs for a young footballer!! He would have to live in London for 3 years first, and that isn't cheap, and there's so many temptations to spunk your money - it really is highly unlikley.
Say by some miracle, he ended up with £1.5m. after 3 years. That's being incredibly optimistic. He'd have a house still to buy (and car etc). £1 mill invested, drawdown following the '4% rule' would only give him £40k gross a year = £35k net. Enough to live on IF sensible & careful, but not exactly set up for life.
Get another 3 years and you are sorted for sure ..... if you have any sense.
Not sure why I've wasted 10 mins of my life on this