Hi there people

Got a gti with coolant issues, replaced water pump already but I still lose coolant after a week or so, I took it to a VAG Specialist and they said it may be the EGR but I was confused, there’s no visible leak after a pressure test but they said if it doesn’t leak externally, it is inside the EGR. Does this Golf GTI Even have a EGR valve if so where is it located? I don’t think the head gasket is gone as the oil level is fine, oil is fine not mixed with water. Any other suggestions