Even the Steam description this 2KSports title quotes 'Multiplayer' and 'Coop' as actual features, it does not support any private lobbies or private invitations to your friends. Please watch this video before you purchase the game.
Despite me contacting 2KSports and flagging up the issue, they seem to show no intention to address it at any point, so I thought all I can do is warn you guys, before you buy it! I hope this helps!
NBA 2K14 is a basketball video game that was developed by Visual Concepts and published by 2K Sports. It was released on October 1, 2013 for Microsoft Windows, PlayStation 3, and Xbox 360;versions for the PlayStation 4 and the Xbox One were also released on the consoles' respective launch dates. LeBron James of the Miami Heat became the cover athlete, and also served as the music curator for the game. 2K Sports also released the DLC pack that as a bonus for pre-ordering the game, they would receive 10,000 VC, bonus content for "Path to Greatness" mode, adding James in the Blacktop mode and a signature skill for MyCareer mode. On August 14, 2013, 2K Sports announced that Crew Mode would return to this year's installment of NBA 2K. NBA 2K14 is the successor to NBA 2K13 in the NBA 2K series.
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