From cricinfo's commentary I would say that Flintoff will be unfit to bowl. England has a 500runs lead, but at the same ground West Indies chased 418 runs, so not everything is lost for them.
Hopefully West Indies won't be that defensive in their play.
I do wish Umpire Koertzen would go away and learn the lbw rule. It gets a bit tiresome him ignoring it every time he officiates.