Christensen was a first-half substitute for Chelsea after club captain Gary Cahill had been sent off, and the 21-year-old, who is back with the Blues following a loan spell at Borussia Monchengladbach, is already looking ahead to next weekend's trip to Tottenham Hotspur.
"Everyone knows what's happened today. We are proud of our second half, we fought well, but we'd made it difficult for ourselves. Now we have to look forward," Christensen told reporters.
"It felt like, once we scored our first, the belief grew in the stadium and the noise, everything, went to a higher level. In the end we could have got something from the game. We have to work in our next game at Tottenham how we played in the second half today."
Christensen has scored seven times in 81 appearances for Bundesliga side Monchengladbach over the last two seasons.