Spurs meet Manchester United in Bilbao on Wednesday night.
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Speaking after Friday night's defeat at Aston Villa, Son says all focus is now on the final.
"It's a very disappointing result and a very bad season," Son told the BBC. "But in the end we can win a trophy and that's what we all hope for."
A win over United would end Spurs' 17-year trophy drought.
"Wednesday will be the biggest day of my life. It will be amazing and I hope we can make history."