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Fenerbahce will take on Benfica in the other tie after the Turkish side eliminated Lazio, while Benfica knocked out Newcastle United 4-2 on aggregate after a 1-1 draw in the second leg.
Draw for the Europa League semi-finals made in Nyon, Switzerland on Friday:
Fenerbahce v Benfica
Basel v Chelsea
The semi-final first legs will take place on April 25, the second legs on May 2.
The final will take place in Amsterdam.
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