The Associated Press
In this Wednesday Sept. 4, 2013 image made available from UEFA, chief refereeing officer for UEFA Pierluigi Collina, right, gives an explanation to assistant referee Kim Thomas Haglund from Norway during the UEFA Referees Summer Gathering at the UEFA headquarters in Nyon, Switzerland. Europe's top referees know they are under intense scrutiny when the Champions League starts next week. UEFA wants its match official teams to get more offside decisions correct after high-profile errors in its marquee club competition last season

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