Arsenal can cope without Alexandre Lacazette for Thursday night's Europa League last-16 clash.
The Frenchman will miss the first leg due to suspension.
"Maybe it [the three-match ban] can be a surprise, maybe not," Emery said in his pre-match news conference.
"We know, usually, when you had a red card, you can take minimum one and maximum three [match ban].
"I spoke with him and he said to me, he was asking for one match and I, in the worst case, I said to him in my opinion it was three.
"We have players and also we have confidence with all the players to play without Lacazette."