Senior designer Ben Jones said that the best-selling sports title, as well as conversations with real-life special forces members, give them ideas for the mode.
Copyright: EA"FIFA was a huge inspiration for us in creating the international feel of Warfighter," senior designer Ben Jones told Digital Spy.
"The idea itself came with conversations with our [Tier 1] consultants, how they work with those guys all the time but also feel that, even though they respect them and work closely with them, they feel a sense of competition to the point where they'll have mixed exercises once a year, where they'll go up against one another to see who's the best.
"And that's really what the game is all about."
Multiplayer allows players to represent one of 12 real-world special forces units, including the SAS.
Warfighter Nations, meanwhile, is a Battlelog-powered metagame where players can represent their nation to compete with others when they play online.
Last week it was revealed that Need for Speed developers helped create a driving level for the campaign.
Announced in February, Warfighter's single-player campaign goes beyond the location of Afghanistan from the original game, expanding to global territories.
It was recently confirmed that pre-ordering the Limited Edition version of Medal of Honor: Warfighter will provide access to a Battlefield 4 beta launching next autumn.
Medal of Honor: Warfighter is available for Xbox 360, PS3 and PC on October 23 in North America and October 26 in Europe.
> Read our hands-on preview with Medal of Honour Warfighter's multiplayer
Watch the multiplayer beta trailer for Medal of Honour Warfighter below: