Arteta infuriated by 'unacceptable' decision to overturn second penalty

Arsenal manager Mikel Arteta called it "unacceptable", and said it was a moment that changed the course of his team's Champions League semifinal against Atletico Madrid.

Meanwhile, Atletico coach Diego Simeone's antics as Dutch referee Danny Makkelie studied the sideline monitor at the Metropolitano stadium came under scrutiny Wednesday.

In a white-hot atmosphere and the score locked at 1-1 in Madrid, Makkelie opted to overturn a second-half penalty awarded to Arsenal when substitute Eberechi Eze went down under a challenge from David Hancko.