Chelsea boss Graham Potter could not bring himself to watch Kai Havertz's penalty on Tuesday, as the forward put the Blues 2-1 up on aggregate in their vital win over Borussia Dortmund.

The German international hit the post with his initial penalty but was given another chance after a Dortmund player encroached on the box.

Havertz slotted his second attempt home coolly, but his boss did not seem overly confident as he held his head in his hands and stared at the ground while the shot was taken.

It came after Raheem Sterling opened the scoring in the first half following several big chances that just wouldn't fall for the hosts.

Havertz had hit the post, Ben Chilwell hit a volley well wide, and Kalidou Koulibaly could not get the ball out of his feet after the ball fell for him from close range.

They held on to the 2-0 lead on the day, sending them through with a 2-1 aggregate victory, and will now advance to the UCL quarter-finals.

Potter's stress is perhaps understandable given the importance of his side's result on Tuesday.

While he was under slightly less pressure following Chelsea's win over Leeds at the weekend, there were still many who felt the Blues boss needed a win against Dortmund to keep his job.

The former Brighton boss will now go into Saturday's clash against Leicester in a more comfortable position.

When quizzed about the penalty on BT Sport, Potter said: 'I couldn’t watch after the first one, I just sat down and listened to the crowd.'

'I knew they’d encroached, our assistant is better at the rules than me and he explained it to me.

'It was him (Havertz) or Recce (James) to be honest, and it's up to them on the pitch.

'We were delighted. I didn’t watch it but I was delighted when I heard the roar. Not for me, taking penalties! I’m in awe of anyone that can.'

'I didn’t watch it but I was delighted when I heard the roar.'