**Chelsea have announced the signing of midfielder Valentin Barco from sister club RC Strasbourg.**
The Argentinian has signed a contract at the club until 2033 and will join up with his new team-mates later on in pre-season.
Barco started his career at Boca Juniors before earning a move to Premier League club Brighton & Hove Albion.
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The 22-year-old then had loan spells at Sevilla and RC Strasbourg before joining the latter on a permanent basis.
He was part of the Argentina squad which reached the final of the World Cup this summer.
Chelsea are also continuing to work on finalising a deal for Rayo Vallecano left-back Pep Chavarría.
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