Guzan joined Villa from Los Angeles side Chivas USA in 2008
Uefa is waiting to view the referee's report before deciding if action will be taken over Rapid Vienna fans' bombardment of Brad Guzan on Thursday.
The Aston Villa reserve goalkeeper had lighters, coins and drinks hurled at him during the first leg of his side's 1-1 Europa League qualifier in Austria.
Meanwhile, the club has apologised to Villa's Andreas Weimann after fans abused him as he was stretchered off.
The club said the fans' behaviour was "disgusting, unfair and unacceptable".
In a statement, the club added: "SK Rapid would like to officially offer this statement as a means of apology to Andreas Weimann, his family and to the club Aston Villa."
Villa keeper Guzan said several of the items thrown at him had hit.
He said: "It's obviously not something anybody should have to cope with, and it's not something you like to see."
At one point, the American, who deputises for veteran first-choice keeper Brad Friedel during cup competitions, picked up one of the objects and handed it to Luxembourg referee Alain Hamer, who in turn passed it on to the fourth official.
Guzan, though, was not overly perturbed by the barrage after suffering similar treatment on international duty.
"It's part of the game, part of the environment," added the 25-year-old, who made three superb saves to deny Vienna a victory after Atdhe Nuhiu had netted in reply to Barry Bannan's opener for the visitors.
"It's a situation when you go into a hostile environment you know the fans aren't going to be too kind to you and you try to get on with it.
"Playing with the national team in central America and some of those countries, I've seen it before.
"As to whether Uefa do anything, that's not for me to decide."
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