The Croatia midfielder admits that moving to the Catalans will represent a huge challenge and reflects on a "wonderful" three years at fellow Liga outfit Sevilla
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Rakitic, speaking ahead of his nation's vital World Cup encounter against Mexico, insisted he was completely focused on Croatia but was also looking ahead to his future with his new club.
"Moving to Barcelona is a big step in my career," the midfielder told a press conference.
"I want to thank Barca for being fair in the negotiations and satisfying Sevilla."
Rakitic, who scored 32 goals in 149 games with Seville and lifted the Europa League trophy last season, also thanked los Rojiblancos for his time at the club.
"Sevilla is my club and I am very sad to leave," he continued.
"I had three wonderful years there in which I got married, had a daughter and had a great time personally."