Tomori was pleased to see his fellow 21-year-old do so well.
He said, "We know what Christian can do and he has had to bide his time and when he has come on in recent games he has done really well, and the manager rewarded him with a start on Saturday and to score a hat-trick, there is nothing better. I am really happy for him that he has managed to open his account and got a hat-trick as well.
"The key to our form is the hard work on the training pitch. Everyone is really focused and we try to work hard every day and implement what the manager is trying to make us do every week. It is a lot of hard work, focus, determination and that will to win, and we have a good mix of experience and young players who are gelling together a bit more now."