While Nicholas believes that Arsenal will go on to win the game, he also expects Atletico to grab a valuable away goal as he predicts a 2-1 score line in favour of the Gunners.
"But I don't think the Gunners were overly impressive at the weekend.
"I thought it was a really strange selection not starting Pierre-Emerick Aubameyang [in the 4-1 win over West Ham].
"Atletico are heavy favourites for me with their defensive strength and Arsenal's backline constantly making me nervous.
"How Shkodran Mustafi is still in the team is beyond me, but the competition isn't really there.
"There's not much between these two sides other than their defences and I can see Arsenal scoring a couple of times at the Emirates Stadium.
"But my concern is keeping that concentration to prevent Atletico snatching a vital away goal."