lammikko made his liiga debut with ässät during the 2013–14 liiga season, appearing in 20 games and recording an assist. he also played in 37 games with the ässät under 20 team, scoring 17 goals and 42 points, followed by three goals and eight points in 11 playoff games. following the season, lammikko was drafted by the florida panthers in the third round of the 2014 nhl entry draft.