Hey guys.
When i am in neutral and with the clutch not pushed in I hear a rattling sound. But when i push the clutch in to change gears the rattling sound goes away, when i remove the foot then it starts again. What can be the problem?

If you rest your foot on the pedal and press just a little bit i.e. not all the way down does the noise go away? Likely to be a noisy release bearing if that's the case. What model GP and gearbox?

Pressure plate bearing is gone, caused excessive pressure plate wear too. Might as well change the entire clutch kit while you're at it.