The 35-year-old originally inked a deal through the end of December on Oct. 4.
In 20 games with Berlin so far this season, Briere has accumulated nine goals and 24 assists for 33 points.
Flyers star Claude Giroux had also been playing for Berlin, but returned home after injuring his neck.
Giroux, 24, picked up four goals and 15 assists for 19 points in nine games with Berlin.
It's unclear if Giroux will return to Berlin if the NHL regular-season is entirely cancelled.
To date, the NHL has cancelled games through Jan. 14, though if a new CBA is not reached by then, the season will likely be nixed.
