Representatives from Major League Baseball and the union held an informal meeting Thursday in New York City to resume talks amid baseball's lockout, according to sources.

MLB deputy commissioner Dan Halem and union attorney Bruce Meyer -- the lead negotiators for both parties -- were joined by league senior vice president Morgan Sword and MLBPA attorney Ian Penny in the session.

The meeting lasted 90 minutes, sources said, and covered the core issues that led MLB to cancel the first week of regular-season games Tuesday.

There have been no reports of when the two sides plan to meet again.