Chelsea responded to that Arsenal setback with a last-gasp victory over West Ham at Stamford Bridge on Sunday.
Christian Pulisic netted the winner after Jorginho had missed from the spot moments earlier — and the Italian felt an extended VAR delay put him off his usual routine.
He said: “When you have that little moment of doubt, that’s usually when you make the mistake.
“Maybe I had too much time to think about it, I don’t know. It went like that this time and I’m sorry.
“I feel bad because it’s not a nice feeling.
“It’s a lot of pressure, especially in games like that when you need to win and it’s the last minutes.
“You try to isolate your mind from all that pressure, even though it’s hard, and then you have the VAR so it takes longer. It’s harder to keep focused but unfortunately this time it didn’t work.”