Good for him but let's hope he's investing most of his salary into today's markets ($24 million/4 years or $6 million/year) in ETF/Mutual funds.
Assuming he takes home 1/2 that money over the next four years because of taxes, stays healthy and gets a similar deal to bring his total career earnings to around $48 million ($24 million after taxes).
Say he spends a million of that a year on expenses/fun over the next 8 years and invests the remaining $2 million/year. In 8 years with an initial $1 million investment at 5% he would have just over $21 million by age 35. So assuming he retires, doesn't work another day in his life and lives off that $21 million with an marginal market return of 5% ... assuming he lives to age 95 he still could make/spend just over a $1 million per year.
Of course these are all rough numbers done on a 401K calculator so there is a small margin of error but again this is assuming only a marginal 5% return on investments (it could be higher and lifetime markets are usually 7-8%), and he doesn't work another day in his life (highly unlikely). Say he takes a job as an assistant coach somewhere and pulls in $250K/year (average assistant salary) and works for another 20 years until he's 55. If he puts 1/2 of that away for another 20 years at age 55 he would have about $60 million. Oh and let's not forget he'll still get a military pension since he saw combat, social security, and an NFL pension.
This is why I just laugh when you hear these morons are broke at age 45.