Before online modes such as Friendly Match, Ranking Match and Master League Online can be played on Xbox 360, players have to download two updates. The first is a small day-one patch that takes the game to version 1.01.
The second is a pack that needs to be downloaded from the game's Information menu to ensure all online players are using the same up-to-date data, but users are currently receiving a 'Download File is Broken' message when trying to implement the update.
Konami says it's "dedicated to providing the best possible gameplay experience to its users, and is working closely with Microsoft to solve the issue".
Konami Digital Entertainment president Shinji Hirano adds: "We would like to apologise to any users who have been unable to enjoy PES 2014 online and would like to reassure fans we'll be fixing the issue as quickly as possible.
"In the meantime we're setting up a special section on the PES 2014 site to keep users up to date on issues, feedback and general help with the product. Our customer support team is also providing as much personal support as possible."
Konami also plans to address a range of feedback from users of all versions of the game when it releases another update shortly. It will add a number of features including an 11 vs 11 mode.
In CVG's PES 2014 review, we said: "Despite its clear issues, PES 2014 remains a worthwhile upgrade to the series, with all-round improved gameplay and a roster of well built modes. Master League remains as deep as ever, now allowing you to manage a national team. Become a Legend returns too, accompanied by a whole host of new leagues and competitions."