Join Date: Feb 2013
Location: Aussie in Sweden
It does sound like the clutch release bearing to me though definitely worth checking the crankshaft thrust bearing as Seadart has kindly alerted you to.
Usually it would be wise to change the whole assembly if you do the release bearing (assuming its the issue) as it just doesn't make sense to do all that work (drop the gearbox, 8-10 hours usually iirc) to replace just the release bearing only to have the clutch fingers wear out 6, 12, 18 months later and have to basically spend the same amount again to fix a clutch issue the second time. Especially since you have no mention of when the clutch was changed (if in fact at all), you might as well just do all of it at once. It would only cost you marginally more to do the entire assembly (pressure plate, clutch plate and releasing bearing) and will save you in the long run. That is my take on it anyways.
2000 Alfa 156 Sportwagon 2.0 TS CF3
2002 Alfa GTV 2.0 TS CF3
1983 Porsche 944