Chelsea and England captain John Terry, who suffered a serious-looking head injury, has recounted his horror moment when he just could not remember anything upon taking the field in the second half of the Carling Cup final against Arsenal at the Millennium Stadium in Cardiff on Sunday.

"I remember walking out for the second half and nothing else until waking up in the ambulance on the way to the hospital.

"I had the scan and they said it's OK. It was great to be back (with the team), they were different class. I'm still feeling a bit groggy though. It's thanks to the lads as I didn't have much part to play in the second half. Throughout the competition they've been spot on," said Terry, who could even play at Portsmouth this weekend provided a doctor gives him the green light.

The FA has stressed that the rest period for a player suffering a head injury depends on the extent of the injury and a doctor would be in charge to assess the damage and certify a player for action.

"Following John Terry's injury in yesterday's League Cup final, the FA can clarify that the rules on head injuries do not set down an automatic rest period for players suffering from concussion, but rather stipulate that each injury must be assessed individually by a doctor.

"The FA medical recommendations state that: 'since all head injuries are different in terms of the effects on the brain, no fixed time periods are applicable in professional football as to when the player should return to training and playing.

“The brain's response to the injury determines the time of return and playing and must be clinically assessed by the club medical officer or a specialist neurosurgeon/neurologist. The clinical rule is that no player should return to training or playing until symptom-free and sign-free at rest and on provocation."