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The 43-year-old re-joined the club two years ago having spent 2018-2019 at Paris Saint-Germain, but he feels the two parties have reached the "end of a cycle".
Over the course of his second spell in Turin, Buffon has been second choice to Wojciech Szczesny, playing 16 times in Serie A since the start of 2019-2020.
He won his 11th league title last term, but under the guidance of his former team-mate Andrea Pirlo, 2020-21 has been a drag for the Bianconeri, who sit fifth in the table with three games to go – Inter have already claimed the Scudetto.
Now he feels it is time to move on again, though he has not come to a decision as to what comes next.