Doctors are gradually reducing the sedation and monitoring her son 24-hours-a-day.
It is not known when Myles may regain consciousness or whether he will have suffered any permanent brain damage.
“It’s just waiting, that’s the bit that’s horrible, it’s just waiting,” said Ms Sarpong.
She said: “Until he is conscious we don’t know what damage there is to the brain. When he had the cardiac arrest he had CPR for 10 minutes so we don’t know the effect of the reduced oxygen on his brain.”
Myles had been living in London for the last four years working as a chef at a cafe in Wimbledon.
He got into boxing as a way to stay fit and boost his mental health, and the match on Saturday was only his second competitive fight.
Ms Sarpong has had to close up her independent sports shop, Runwise, in Wallingford so that she can be close to Myles.
