Christensen was joined in a back three by Trevoh Chalobah and Premier League debutant Malang Sarr, with the trio impressing.
"He showed on Saturday he is one of the top keepers in the world, not just the Premier League. He is a top goalkeeper," Christensen told the club's website of Edouard Mendy. "You can see how important he is to us, to the team. Yet again we are lucky we have him.
"People can see and recognise what he can do and the quality he has. It is hard when you watch him every day because you don't see the process. We just enjoy having him here. He was always a confident goalkeeper when he came in.
"He is very loud on the pitch and really nice, confident guy off the pitch. He is trying to just help us every time. There were a lot of set pieces against us and we had to work hard not to concede.
"He is putting jobs on all of us that he wants us to do which is great. And if he feels safe that is a great thing. It gives him space to do what he can do, so we will listen to what he says."
The Dane was also delighted for matchwinner Ben Chilwell: "'He always stayed patient, is a very happy guy and we see that every day.
"His mood hasn't changed. Obviously, it is frustrating for him when he is not playing but now he has to work through it.
"He deserves everything and all the success right now. Three goals in three games and I am happy he kept his patience and kept working hard."
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