Frey admits he's enjoyed watching Inter this season.
He told TV Play: "I enjoy watching this Inter more than the one that won the Scudetto with (Antonio) Conte.
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"The data then speaks clearly: the Nerazzurri are the best defence in Europe."
Frey added: "Inter made a very intelligent transfer market and the squad did not weaken, also thanks to (Beppe) Marotta who was the protagonist of this rebirth."