Chelsea manager Jose Mourinho says it's "too difficult" to win the domestic treble this season.
They're one match away from Wembley after a 1-1 draw at Liverpool in their League Cup semi-final.
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Mourinho says the competition is just as important as any other trophy they're fighting for.
The other Capital One Cup semi-final will get underway later tonight.
Tottenham have home advantage for the first-leg of their match-up against Sheffield United, with kick-off at White Hart Lane at 19:45.
