The burly ex-Liverpool star hopes he can return within the next five weeks - just in time for England's match with Croatia on November 21.
"You never know, once I get the boot off, it might have healed a little bit quicker.
"I hope I'm a quick healer, although I've never had anything too serious before in my career.
"The doctor thinks it was something which had been going on for a while and this was the last straw.
"It could have happened on the training ground or during a match - it was just one of those things you put down to luck or a lack of it.
"Now I'm having to be patient. The protective boot comes off next week and then I can start putting my weight through the foot.
"That is when I'll know more about when I can start to step things up a bit."