FIFA Ultimate Team is currently the key "differentiator" for the series in its long-running rivalry with Konami's PES franchise, according to a senior executive at EA.
As of March 2014, almost 22 million unique players had played the game mode, which enables users to create their own fantasy teams, with nearly 265,000 Ultimate Team matches played daily.
"I think the real key is Ultimate Team, that's the real differentiator," EA chief operating officer Peter Moore told CVG in a newly published FIFA interview.
"The levels of engagement that we've built over the past four of five years since the inception of Ultimate Team makes it less about having to prove yourself every year and reacquire that customer."
While Konami opted not to launch PES 2014 on Xbox One and PS4, PES 2015 will go head to head with FIFA 15 on the latest round of consoles, as well as additional formats, later this year.
"Konami is a fine competitor and we'll take them on," Moore said. "I think their challenge is working out how they can develop a real meaningful online multiplayer element to PES that will compete with Ultimate Team.
"I think the core loves Ultimate Team. It's 24 hours a day and it captures what's going on in football around the world. The team behind Ultimate Team is very large and it's almost like a war room, where the team is constantly looking at what's happening in England, in Spain etc.
"So it's less about shipping a game, consumers enjoy it, and then we have to go and fight for their attention the following year," Moore added. "This is about true engagement with what football is about."
The FIFA 15 release date is September 23 in North America, September 25 in Europe and September 26 in the UK. The game will be available on Xbox One, PS4, Xbox 360, PS3, Wii, PC, 3DS and Vita.