2008-09: Calle Jarnkrok spent most of this season with Brynas' J20 squad. In 41 games for the SuperElit club, Jarnkrok scored 8 goals and picked up 18 assists for 26 points. He also picked up 37 penalty minutes in those games. In 7 playoff games for Brynas, Jarnkrok scored 4 goals and added 3 assists for 7 points. Jarnkrok was a part of Sweden's 2009 U-18 World Junior Championship team. He scored 2 goals and added 7 assists for 9 points in 6 tournament games.
2009-10: Split time between the Brynas J20 and Elitserian clubs. In 19 games at the J20 level, Jarnkrok scored 11 goals and added 20 assists for 31 points. He picked up 1 more assist in 2 playoff games for this squad. At the Elitserian level, Jarnkrok scored 4 goals and added 6 assists for 10 points in 33 games. In 5 playoff games, Jarnkrok picked up 1 goal and 1 assist for 2 points. Jarnkrok was chosen in the second round, 51st overall, of the 2010 NHL Draft by the Detroit Red Wings.
2010-11: Jarnkrok spent the entire season on Elitserien’s Brynas team, posting 11 goals and 16 assists for 27 points in 49 games. He also went on to score 3 goals in 3 post-season games before going down with a shoulder injury. Had an impressive campaign for Sweden at the WJC, where he posted 2 goals and 3 assists for 5 points over 6 games.
2011-12: Jarnkrok was the second-leading scorer for Brynas in Sweden's Elitserien as a 20-year-old and was played for Sweden in the 2012 IIHF World Championship. He scored 16 goals with 23 assists and was minus-three with 22 penalty minutes in 51 games; averaging almost 16 minutes of ice time per game. Brynas, after finishing fourth in the regular season, captured the Elitserien playoff championship. Jarnkrok scored 4 goals with 12 assists and was plus-12 with 12 penalty minutes in 16 playoff games. In eight games at the World Championships he had 1 assist and was an even plus/minus as Sweden finish sixth.
2012-13: Jarnkrok made his North American pro hockey debut in April following his fourth season with Brynas in Sweden's Eiltserien — skating in nine games with Detroit AHL affiliate Grand Rapids — before returning to Sweden to play in the 2013 IIHF World Championship. He had 3 assists and was + 3 with the Calder Cup champion Griffins but did not skate in the playoffs. Jarnkrok was Brynas' leading scorer with 13 goals and a team-high 29 assists in 53 games and was -2 with 12 penalty minutes. Brynas finished eighth, capturing the last playoff spot, being swept by champion Skelleftea in the first round. Jarnkrok was -3 with no points and 6 penalty minutes in the four-game series. In ten games for Sweden at the World Championship he had 1 assist and was -2 with 4 penalty minutes. Sweden defeated Switzerland, 5-1, to capture the gold medal.
Jarnkrok’s most obvious positive is his very good puck control, as he shows an ability to hang on for extended periods of time. He projects as a playmaker, as he is more apt to setting up plays than finishing them. Jarnkrok also boasts high-end skating ability and he possesses a great deal of hockey sense.
Where Jarnkrok plays in 2013-14 is likely up to how he performs at Detroit's training camp. The Red Wings already have an overabundance of NHL forwards, but Jarnkrok could still compete for a job. At the very least he will gain valuable AHL experience with the Grand Rapids Griffins.
Jarnkrok was dealt at the 2014 NHL Trade Deadline by the Detroit Red Wings along with Patrick Eaves to the Nashville Predators in exchange for David Legwand.