2010-11: Adam Ollas Mattsson played for lower division club Varmdo HC in the Stockholm suburb of Gustavsberg; appearing in games with the club’s U20 and U18 teams as well as playing for the U16 squad.
2011-12: Ollas Mattsson skated for Djurgarden in the top division of Swedish junior hockey, played for the national U16 team and was part of the bronze medal-winning Stockholm 1 team in the TV-Pucken tournament for high school players. He was -1 with no points nor penalties in his only game with Djurgarden’s U18 team and was +8 with 4 assists and 6 penalty minutes in eight games with the club’s U18 team. He was +5 with 1 assist and 2 penalty minutes with Sweden’s U16 team. Ollas Mattson was +12 with 2 goals, 1 assist and 4 penalty minutes in eight TV-Pucken games.
2012-13: Ollas Mattson played his first full season with Djurgarden — skating for the club’s U18 team — and represented Sweden in the 2013 U17 World Hockey Challenge in Canada. He had 8 assists and was +32 with 44 penalty minutes in 32 regular season games for Djurgarden and was +4 with 1 assist and 6 penalty minutes in eight playoff games. He had 3 assists and 26 penalty minutes in six games at the WHC. Sweden defeated Russia, 7-5 in the gold medal game.
2013-14: Ollas Mattsson represented Sweden in the 2013 Ivan Hlinka Memorial Tournament in August before returning to Djurgarden. In four games at the Ivan Hlinka Tournament he was +4 with no points and 2 penalty minutes. Ollas Mattsson was ranked 17th amongst European skaters in Central Scouting’s mid-term rankings prior to the 2014 NHL Draft.
Mattsson is a very tall defender with good weight and some real snarl. Has experience with men and has shown himself to be even more adept playing against older players than boys his age. Seeks physical play in solving problems and handling defensive situations in his zone. Loves to give it to smaller forwards who challenge him and think they can slip by taking the low route. Puts his long reach to good use, constantly bothering opposition attackers. Positioning is usually sound and he shows no hesitation in blocking shots. Mattsson has a decent first pass and has shown an aptitude for blueline play, although the offensive game doesn’t yet appear to be the strength of his game. Is good at keeping pucks in the offensive zone as well as generally blocking passes.
Mattsson was set back by an injury this winter and really needed some time to get up to game speed. It’s uncertain how much that may have ultimately set him back in this big year of development. Mattsson has shown weaknesses in foot speed and concentration, making his fair share of errant and/or poorly chosen passes.