The Catalan side failed to win a major trophy under Gerardo Martino last season, the first time in six seasons they have failed to secure success in either La Liga, the Copa del Rey or the Champions League.
Luis Suarez, Marc-Andre ter Stegen and Claudio Bravo have also joined this summer, while the likes of Gerard Deulofeu and Rafinha return from loan spells to give the squad a fresh look under new coach Luis Enrique.
Rakitic, who arrives from Sevilla after helping Unai Emery's men to glory in the Europa League, says that it has been made clear to the new arrivals that another dry season will not be tolerated.
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"I keep saying that I am not here to replace anyone. I come to Barca to be Ivan Rakitic. Replacing Xavi? He is still at the club.
"I cannot wait to meet all my team-mates and to be part of a football style everyone is talking about. I want to learn from them all but I also want to be able to contribute and help them to improve as well.
"I have spoken to the coach. Barca play with a 4-3-3 and he told me I can cover all three midfield positions.
"Due to the World Cup there was not a huge amount of time to talk to him but I have spoken a lot to Andoni Zubizarreta. Midfield is a very important position for them and now I am part of it."
Rakitic will face a Primera Division title battle against two international team-mates next season, with Modric playing a key role for Real Madrid and Mario Mandzukic having signed for champions Atletico Madrid.
"We have been having jokes about it," the Barca man added. "In last year's [Champions League] final I cheered for Luka but now I have told him this season you will finish second ... and Mandzo will be third!"