This problem is almost certainly due to the clutch not disengaging properly, presumably you are having to push the pedal right down to the floor. I assume its a hydraulic system which means you can't adjust it, but its worth checking the system first before blaming the clutch itself, some clutch slave cylinders are inside the clutch housing so it has to come off anyway.
I don't really know the system on this car so maybe someone else can give you more information.
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