Barcelona have agreed a deal with Arsenal to sign Thomas Vermaelen on a five-year contract.
The news that the 28-year-old Belgium defender is to make the switch was announced by both clubs on Saturday evening.
Arsenal confirmed Vermaelen passed his medical in Barcelona earlier that day, adding that his transfer is "subject to the completion of the normal regulatory process."
The fee is undisclosed for a player who had been club captain for the Barclays Premier League side for the past two seasons but was frequently on the bench last term, with Per Mertesacker and Laurent Koscielny the first-choice pairing at centre-back.
He made only 13 starts in all competitions and 21 appearances in total for Arsenal during the campaign, which concluded with him being an unused substitute in the Gunners' FA Cup final victory over Hull as they collected their first trophy in nine years.
Vermaelen was initially an integral part of the London club's defence after signing from Ajax in 2009, but form and fitness have subsequently put his starting spot in jeopardy.