From SkySports:
When asked what he was hit by, Guzan told Sky Sports News: "A couple of beers, some water and lighters.
"You don't like to see it anywhere in football. I'm sure Uefa officials were at the game and will look into it.
"The fans here create a good atmosphere. We knew it would be a tough game.
"We'll take the 1-1 result. This is a result we will be happy to take back to Villa Park."