The urgency of the talks heated up this weekend after the league decided Friday to cancel the Winter Classic.
NHL contract talks continued past midnight Saturday aimed at settling the lockout, according to news reports.
USA Today reported that both sides were still meeting at an undisclosed location past midnight Saturday and into Sunday.
This weekend's contract talks are the first ones since both sides last met Oct. 18.
The urgency of the talks heated up this weekend after the league decided Friday to cancel the Winter Classic, one of the NHL's most popular annual events. This year's Classic was slated to be held this season on Jan. 1 at Michigan Stadium in Ann Arbor and feature the Detroit Red Wings and Toronto Maple Leaves.
All regular-season NHL games through the entire month of November have already been cancelled due to the lockout. More games could be cancelled if both sides fail to reach an agreement soon.