But for every top team underperforming, there's an underdog seizing their moment and taking their place. And during this phase, Aston Villa, Lille, Brest, Celtic and Club Brugge certainly rose to the occasion as they all secured unexpected placings in the next round.

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Another absorbing "Battle of Britain" is in store today in the UEFA Champions League, between Aston Villa of the English Premier League and Scottish champions Celtic. Both sides need a win to boost their hopes of automatic qualification for the last 16.