Kim made four appearances for the Bees last season. He moved to Brentford in 2023 from Seongnam.
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Brentford chief Phil Giles told the club's website: “This is an excellent opportunity for Ji-soo to go and play competitive football at a good level.
“He has made good progress since joining us and we were very pleased to see him get a Premier League debut last year.
“We wish him all the best for the coming season and will be monitoring him closely.”