Alli scored a special opener in the 10th minute and then set up both Carlos Vinicius, who added a late second, and Gareth Bale as Spurs made it through to the last 16 with an 8-1 aggregate victory over the Austrian side.
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The Wales international has been a shadow of his former self since his loan return from Real Madrid and looked to have fallen out with boss Jose Mourinho last week after making himself unavailable for the FA Cup game at Everton.
United will travel to the Anoeta to face current La Liga leaders Real Sociedad after dropping into Europe’s second-tier competition following their Champions League exit.