I would always do a 9 miler 7 days before, then 2 more runs of 5/6 miles (steady pace) in the week leading up to it.
Interestingly, whilst I normally try to also "get out" of football, I got a HM PB (1.19) the day after a full game of 11 a - side........not tried it since mind..............not sure why not???!!
Good luck - great distance - you'll love it!