Could be, maybe the clutch is sticking on rusted input shaft splines, maybe the plate is warped, or the springs in the cover plate u/s...could even be uneven operation of the clutch pedal as its been standing, but its smart to eliminate all other possibilities before stripping off the gearbox to check, as once you do that you should change the clutch assembly anyhow to save having to do it all again in short order.
Check the engine and gearbox mounts, the exhaust mounts and routing etc and use a process of elimination.