Pastrnak, a 6-foot, 198-pound native of Havirov, Czech Republic, spent the majority of the 2013-14 season with Sodertalje of the Swedish B League where he appeared in 36 games and accumulated eight goals and 16 assists for 24 points.

The 18-year-old also played on the Czech Republic U18 World Junior team where he served as assistant captain, the Czech Republic U18 International Junior team, the Czech Republic U20 World Junior team, and the Czech Republic U20 International Junior team.

During his time with those teams he totaled seven goals and 16 assists for 23 points in 35 games played.

Combined, the forward appeared in 69 elite-level games where he tallied 28 goals and 30 assists.