Footage of the incident here:
https://m.youtube.com/watch?v=PFiGT9LTLqU
As one contributor has said, it was lucky that he was the focus of attention when the ball was passed to him as otherwise it might have been vital seconds before it was noticed.
If it was his heart maybe the excitement of the ball being passed to him was enough to tip it over the edge. There's been one or two incidents like this fairly recently, I don't recall this happening in the past
Hopefully he's on the mend now.
Is this why Match of The Day and the Thierry Henry programme was replaced by a film instead?