Hi guys new poster here but hope somebody can help.

I have a 55 plate 1.6 A3 FSi. Iv'e noticed a rattle has started when i put in the clutch pedal. When in neutral and the car is just ticking over it is fine. And when driving and its in gear its fine. But once the pedal is pushed in and the clutch is opened up it rattles. Its not quite a grinding noise but similar. It sounds like its rattling at high speed in relation to the revs. anybody got any ideas before i take it to a garage?