Inter have confirmed the departures of Federico Dimarco and Andrew Gravillon. Dimarco has joined Swiss club FC Sion on a permanent basis while Gravillon has joined newly promoted Benevento permanently too. The figures of each deal were not disclosed.
Source: Inter.it

if there is no buy back option then we shot ourself in the nuts like that fool in that movie 8 miles
This article says theres a buyback option for both
https://www.serpentsofmadonnina.com/2017/6/30/15894644/miangue-returns-to-cagliari-dimarco-signs-for-sion#comments
when was the last time Inter ever exercised a buy back option ???? if they had that for Caldirola why haven’t they exercised it yet ? but that’s right you have NAGATOMO at LB !!
thanks it made me feel a lot better, both are class