2008-09: Oscar Klefbom spent most of the season in the Farjestad organization. In 15 games for the J-18 squad, Klefbom, scored 2 goals and added 2 assists for 4 points. In 4 playoff games for that squad, he added 1 assist. Klefbom also played 3 games for the J-16 team, scoring 2 goals and adding 2 assists for 4 points. In international play with Sweden's U-16 team, Klefbom scored 1 goal and added 2 assists for 3 points.
2009-10: Klefbom played most of the season for Farjestad's J-18 team. In 31 games for that team, Klefbom scored 10 goals and added 18 assists for 28 points. He registered no points in 6 playoff games for that team. Klefbom played for Sweden at the 2010 World U-17 Hockey Challenge, scoring 1 goal and adding 3 assists for 4 points in 6 games for the bronze medalists.
2010-11: Klefbom received his first action in Sweden's Elite League, playing in 23 games for Farjestad. He scored 1 goal and added 1 assist for 2 points. Klefbom also spent some time with Skare BK at the Division 1 level, picking up 1 assist in 12 games for that team. He also sspent some time with Farjestad's J-18 team, scoring 3 goals and adding 3 assists for 6 points in 8 games. Klefbom captained Sweden's silver medal team at the 2011 U-18 World Junior Championship, scoring 1 goal and adding 3 assists for 4 points in 6 games. He was named one of the top 3 players on his team for that tournament.
2011-12: Klefbom steadily worked his way into the lineup with Farjestads in Sweden's Elitserien as an 18-year-old and was named to the all-tournament team while playing for gold medal-winning Sweden at the 2012 U20 World Junior Championship. He had two assists and was minus-one with 4 penalty minutes in 33 Elitserien games. Farjestads reached the Elitserien semifinals after finishing sixth in the regular season. In the playoffs Klefbom averaged a season-high 19:33 minutes of ice time and was minus-three with 1 assist and 2 penalty minutes. In six games for Sweden at the WJC he was plus-eight with 1 goal and 1 assist and had 2 penalty minutes. Sweden defeated Russia 1-0 in the gold medal game. Klefbom signed a three-year entry-level deal with Edmonton in June, 2012.
2012-13: Klefbom skated in 11 games for Farjestad in Sweden's Elitserien; suffering a season-ending shoulder injury that required surgery in October 2012. He had 3 assists and was +7 with 2 penalty minutes.
Klefbom is a raw, tantalizing talent. He has great size for a rearguard, is an excellent skater, and has tremendous natural offensive instincts. This combination of size, speed, and skill had scouts salivating over him in the 2011 draft, and many in the Oilers organization are enthused about what he could potentially become. He has work to do on his positioning, his defensive play, and generally on the finer aspects of the game, and will be given every opportunity to develop those abilities.
After undergoing shoulder surgery that ended his season in Sweden prematurely, Klefbom made the trip across the pond to skate with the Oilers and participate in development camp. He will likely be vying for a spot on the Oilers roster following training camp in September.