The Spanish defender was deemed surplus to requirements after failing to stake a claim in the side under Ernesto Valverde.
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He leaves Camp Nou having won two La Liga titles and three Copa del Rey crowns.
The 31-year-old, who was earlier associated with German football club Bayern Munich, signed a three-year contract with Barcelona and is now all set to join the club following a medical in coming days. As well as his three Bundesliga titles he also helped the German giants win the DFB-Pokal in 2016 and the German Super Cup twice.
The Chilean footballer became Barcelona's fourth major signing after they roped in Brazillian strikers Malcom and Arthur Melo, along with French footballer Clement Lenglet. "He always led from the front in important matches, and we could always rely on him". "Arturo made a significant contribution to the great successes we enjoyed in this time".