£25k a week for 4 years adds up to more than £5m, probably around £3m to £3.5m after tax. Add that to whatever he had earned prior to getting that deal plus a signing on fee he got, which must add up to more than £1m, and you have a bloke in his mid-20s with more than £4m on his account. I'd say he won't have to do much for the rest of his life.
If he's a typical footballer with a footballer's lifestyle and upkeep, a lot of that money will have been spent liberally over the duration of the contract.
Now, according to all the reports and rumours about him, he's more frivolous than the typical footballer, so unless he had or has some kind of kitty for his exploits, he's probably spent more than the average player would at the same age.
All comes down to how screwed on his head is with assets and finance, really... and on that score do you think he or the people that manage his funds have thought anything about the long-term?
I do think as long as he's secured some assets (house, car, etc) he's sorted for the majority of his life no matter what, but with his age and the way he seems to have led his life since being ravaged by the injuries it wouldn't be a surprise in any way if he ends up being a tragic story who we hear of being on the scrap heap in few years time.
From the little that was seen of him as an up-and-comer, he looked a talent. Can't be at all nice to have that taken away from you.