FA to look at Thatcher challengeThe Football Association has confirmed it is investigating Manchester City defender Ben Thatcher's challenge on Portsmouth's Pedro Mendes.
Thatcher received a yellow card for his challenge which left Mendes needing oxygen at the pitchside.
Mendes later suffered a seizure en route to hospital.
An FA spokesman told BBC Sport: "Our compliance unit is looking at it, but Fifa rules make it difficult to upgrade a yellow card to red."
Thatcher appeared to catch Mendes with his forearm, sending the Portuguese midfielder into advertising hoardings.
The FA will wait to see the contents of referee Dermot Gallagher's match report before deciding its next course of action.
Had Gallagher dismissed Thatcher for violent conduct, FA rules allow it to impose further punishment on top of the three-match ban the offence carries.
Portsmouth boss Harry Redknapp called for the FA to take action against Thatcher.
The incident was captured by television cameras but video evidence cannot be used to retrospectively upgrade a yellow card.
A Fifa spokesman confirmed to BBC sport: "It is one of the fundamental rules of the game that the referee's decision is final.
"Therefore, if his decision that an offence warrants a yellow card, that cannot be changed later by somebody else."
Mendes was taken to Manchester Royal Infirmary where his conditions was described as "comfortable."
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