O'Reilly replaces Seguin on Canada's World Cup roster
The 25-year-old is coming off one of his most productive NHL seasons, recording 21 goals and 39 assists in 71 games. He's a left-handed, natural center, and won 56.5 per cent of faceoffs in 2015-16.
O'Reilly's also won back-to-back gold medals with Team Canada at the IIHF World Championship and earned the Lady Byng trophy in 2014.
"It's never easy to lose a player to injury, let alone one of Tyler's caliber, but once again, it speaks to the depth of talent in the country to be able to add a Ryan O'Reilly to our team," Team Canada general manager Doug Armstrong said.