Christensen is well aware of the challenge that lies ahead in Baku, having come up against Pierre-Emerick Aubameyang when on loan at Borussia Monchengladbach while the 29-year-old was at Borussia Dortmund.
He told the London Evening Standard: “We know how big a test it is going to be having faced those two forwards in the League. It is going to be tough. We are going to have to be clever and think quickly on our feet.
“I played against Aubameyang a few times in the Bundesliga. I don't think I have a great record against him from that time.
“The two of them have a bit of trickery and speed up front. They have got a little bit of everything, we have to be careful. But we believe in ourselves."