squeal when pressing clutch any ideas what this could be ?

Well I have had my clio over a month now and am very happy with it . The only problem is there seems to be a screeching noise when I press my clutch pedal in and when I release the pedal it goes away . Now I,m wondering could this be the thrust bearing ? it only seems to do it when the car is cold when it warms up it seems a lot better but it is still there slightly when I,m pulling away . I don't have any issues with engaging gears and the gearbox feels smooth and very precise . Any advice would be appreciated