UEFA are awaiting a report from their match observer on the pre-match incident, which saw a window of the bus shattered by a missile. Alex McLeish´s side went out of the competition on the away-goals rule with their heads high, but the club may face action if it can be proved their supporters were behind the attack. Spanish police clashed with supporters outside Villarreal´s stadium, El Madrigal, and UEFA look set to launch an investigation.
A spokesperson told PA Sport: "Once we receive a report from the UEFA delegate then we look into what exactly went on. We expect that to arrive two days after the game but if these incidents did occur then action is likely to happen."
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