The two clubs and the player announced on Tuesday that Italy defender Davide Zappacosta had left Chelsea to return to Atalanta, without stating the term of the contract.
“Goodbye ChelseaFC, what an incredible journey!” the 29-year-old exclaimed on Twitter.
“Being a part of one FA Cup and one UEFA Cup gives you a special feeling! “I appreciate everything.”
Zappacosta then switched to Italian in a tweet aimed at fans of Atalanta, where he spent four years before moving to Torino and then Chelsea in 2017.
“Bergamo! You’ve seen me grow as a man and as a player: coming back here is really special,” he wrote.
“Thank you for your trust and esteem: I’ll sweat to the last drop for this jersey and this city. As a man and as a footballer.”
Zappacosta made 52 appearances for the Blues before being loaned out to Roma and then, last season, to Genoa. He has 13 Azzurri caps, the last of them in 2018.
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