Havertz struck late to deliver Chelsea the points.
He said, “It was amazing to score in the last minute like this.
“It was very tough. Newcastle made life hard for us. Up front it was tough – they have big defenders, who always tried to block us and foul us.
“But we talked about this at half-time and how to get round this. We dug in, tried to give our best and in the end it was brilliant for us.”
On his challenge on Dan Burn, he continued: “People know me not as a player who does things like this. This guy is like seven, eight foot and I have to jump against him. You have to use arms to jump and when I jump he is higher than me, so it is tough.
“I can say sorry because I saw he was hurt and feel bad, but you cannot tell me I did this on purpose.”
On the situation at the club after sanctions were placed on Roman Abramovich, Havertz added: “It’s tough, we players are privileged to train and continue to do what we love. We feel sorry for everyone. The supporters, the workers, not just us professionals.
“It’s a tough time for everyone. We try to give everything for them in the moment. We have to stand together, we try to do this and give them a good feeling.”