The start of Major League Soccer's new season could be delayed, just two days before it was due to kick off.

MLS and the Players' Union are at loggerheads over the Collective Bargaining Agreement (CBA), the last agreement of which expired in January.

A similar dispute occurred in 2010 but was resolved a week before the season.

The new campaign is due to kick off this Friday when Ireland captain Robbie Keane and his Los Angeles Galaxy team-mates take on Chicago Fire.