O'Reilly to play for Canada at World Championship
The Clinton, Ontario, native has made five trips to the World Championship, winning gold in 2015 and 2016. His last international appearance with Canada came at the World Cup of Hockey in 2016.
This year's tournament will be held in Denmark and begins May 4.
O'Reilly has recorded 57 points in 77 games with the Sabres this season.