Having lost last week’s first leg 3-2 in Barcelona, they won 2-1 with a goal in the last minute of the game last night.
That sent them through on away goals, the second time a team from the third tier has reached the last four, and are likely to face Athletic Bilbao next.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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