Any potential trade that the Knicks make for Giannis Antetokounmpo would more than likely involve Karl-Anthony Towns. That would mean that the Knicks would need to rely heavily on Mitchell Robinson, who would be the only trusted center on their roster.
It would also mean that the Knicks would have to give Robinson a new contract, as he will become an unrestricted free agent following this season. Ian Begley of SNY recently speculated that the fact that no extension has happened means that Robinson and the Knicks are likely pretty far apart on what they deem to be a fair number for a new deal.