He said: "We have to be prepared for everything on the pitch. But we've got to make sure we are professional and do the job we did last week - in their stadium.
"I've been spat at in European games before. People react in different ways to it but it's the lowest of the low when they do it.
"You have to try not to see red and remember where you are. I'd rather get a smack than be spat at.
"We know what to expect, we know what we are going into and that it will be tough. It will be a hostile crowd. Their players will want to upset us and try to influence the referee.
"But we have to rise above it. If we do, we'll get the job done and go into the next round."