Finally some sense. I work in Haematology Research and I can tell you that Simmonds is nowhere near out of the woods. He will have been on warfarin for 6 months from the time of the clot (when did it happen again?). Then depending on blood results as to whether there is a factor in his blood which contributed to this, he could be on warfarin for the rest of his life. Now if this was to happen, he would almost certainly have to retire - playing footy would be too great a risk for an internal bleed. Even if he stops the warfarin after 6 months he will be way behind with his fitness for next season....
It's a strange condition to get, unless he had a risk factor like a fracture or long plane flight etc. Thought they usually only take warfarin for 3 to 6 months for the first time. Those genetic conditions are pretty rare, and he'd know by now if he had one I'd guess. He should be fine.