2009-10: Markus Lauridsen skated for Linkoping's U20 team in his third season with the Swedish club and represented Denmark in the 2010 Division 1 Group A World Junior Championship. He had 3 assists and was +2 with 12 penalty minutes in 37 SuperElit league games. Linkopings was fifth in the regular season and reached the playoff quarterfinals. In six playoff games Lauridsen was -1 with no points and 2 penalty minutes. He had 3 assists and was +3 with 4 penalty minutes in five games for Denmark's U20 team. Denmark was 4-1 and finished second to Germany in the tournament.
2010-11: Lauridsen played for the USHL's Green Bay Gamblers in his first season in North America and again skated for Denmark in the Division 1 Group A World Junior Championship. He played in 44 of 60 games for Green Bay and scored 5 goals with 5 assists; finishing +4 with 16 penalty minutes in the regular season. The Gamblers finished second in the Eastern Division and reached the Clark Cup finals against Dubuque. Lauridsen was +6 with 4 assists in 11 playoff games. He had 1 goal with 6 assists and was +5 playing in the WJC as Denmark finished first in the tournament in Slovenia. He committed to joining his older brother Oliver at St. Cloud State in 2012-13.
2011-12: Lauridsen returned to Green Bay for a second season as the Gamblers dominated the USHL – finishing with the league's best record and capturing the Clark Cup playoff title. In 58 regular season games Lauridsen scored 6 goals with 24 assists and was +32 with 32 penalty minutes. He scored 3 goals with 1 assist and was +10 with 8 penalty minutes in 11 playoff games.
2012-13: Lauridsen attended training camp with Lake Erie, foregoing a college hockey career, and signed an AHL contract with the Monsters. He concluded the season representing Denmark in the 2013 IIHF World Championship. Loaned to the Central Hockey League's Denver Cutthroats to start the season due to the NHL lockout, he appeared in two games with the Monsters in November before joining Lake Erie for good in January. He had 12 assists and an even plus/minus with 16 penalty minutes in 36 AHL games. Playing in the CHL with Denver, Lauridsen scored 6 goals with 9 assists and was +2 with 14 penalty minutes in 30 games. Lauridsen skated in seven games for Denmark and was -1 with 1 assist and 4 penalty minutes. He signed a two-year entry-level contract with Colorado in March, 2013.
Lauridsen quickly adjust from European ice to North American ice and immediately contributed points from the backend for the Green Bay Gamblers of the USHL. He is the prototypical big defenseman with a booming shot and has been lauded for making the safe play to keep the puck out of his zone. He is also a responsible player and rarely commits penalties.
He split last season between the Denver Cutthroats and Lake Erie Monsters but started his second professional season with the Monsters. He is off to a slow start but that is due to a smaller role this year compared to last year.