Could be either, or both cylinders, could be some air in the system. Is the slave cylinder wet, or is the fluid level down in the reservoir? If, so replace the slave. If it's dry, and no fluid loss, there may just be air in the system, and when you replace the hose you'll have to bleed it anyway. You might also see a little fluid loss at the pedal side of the master cylinder, in which case, that would need replacing.
Finally, there's also the possibility of a failing clutch pedal pivot. Does the pedal appear lower than the brake pedal? If you reach down and grab the pedal, can you pull it up? If yes, then the pivot needs replacing.
Dean - '87 & '92 Spider Veloce's