Career
Josi began playing professionally with South Carolina Bern in 2006. He was selected by the Nashville Predators in the second round, 38th overall, in the 2008 National Hockey League Entry Draft. He was considered one of the top Swiss prospects in the draft.
Josi was selected to play for Switzerland at the 2010 Winter Olympics.
He previously represented Switzerland at the 2007 and 2008 IIHF World U18 Championships, the 2007, 2008 and 2009 IIHF World U20 Championship and the 2009 Ice Hockey World Championship. Josi scored his first National Hockey League goal on December 10, 2011, against Dan Ellis of the Anaheim Ducks.
Josi was selected as the tournament Most Valuable Player at the 2013 IIHF World Championship in Stockholm, Sweden. Josi was selected to play in the 2016 National Hockey League All-Star Game.