Then say: “… and the next card: the Ace of Diamonds I will place in the centre of the pack”. Do this but of course do not let the audience see this card. Then say “Finally, I will place the Ace of Clubs face down near the top of the pack” which you do.
Of course, by this point the trick is already done as the Ace of Diamonds is not actually in the pack but wherever you placed it earlier. Allow a spectator to go through the pack to verify that the Ace has disappeared. This allows you to reveal the Ace of Diamonds in whatever way as you wish!
NOTE: For anyone who enjoys unusual card tricks involving Aces, you might want to read about Stanley Collins. He was an English magician born in the late 19th century whose card magic was ahead of its time. His Collins’ Aces card trick is still performed today.