I reckon it's our goalkeeper Alex McCarthy. It won't be a big player anyway, someone with a handful of caps.
This must be very tough for the FA to work out, despite knowing he was tested and who they checked. They'd have to check the list, see who was away, in a conflicted dressing room and played for England. It could be literally dozens of players. Or one. Probably one.
I remember the RS lads saying last season that Clynes unexplained injury was in fact a beak suspension. My money would be on him.