Larsson has been out of action since the disbandment of SK Gaming's Counter-Strike division back in July, and though he has been streaming some CS:GO matches, he has not yet committed himself to any project.
Karlsson, on the other hand, has been inactive since November, when he was replaced by Dennis "Rytter" Rytter in fnatic shortly after the team's transition to CS:GO.
The Swedish duo have now decided to attend Copenhagen Games with other former 1.6 players in an all-Scandinavian mix called Alchemists.
Delpan to play first CS:GO tournament
Joining them will be John "hyvlarn" Edelsvärd - whose only CS:GO project to date came in the form of Prospects, who later became Absolute Legends - and Gunnar "zEn" Eng, who were curiously last seen competing on an international level at Copenhagen Games last year with Alchemists, who crashed out of the tournament in the group stage.
The last player to join Alchemists is the one who has picked up the biggest amount of experience in CS:GO: Alexander "rdl" Redl, who is currently a free agent following the disbandment of Absolute Legends.
"I spoke with hyvlaren, who had talked to FYRR73, then Delpan signed up and so on, and rdl came in last," Eng told HLTV.org.
"Everyone is playing CS:GO now so it is going to be fun to be at Copenhagen Games and try things out in a real tournament. We will practice intensively for a week.
"We want to go past the group stage and get to the playoffs. We will take it one game at a time. We will have to study our opponents to have some sort of chance against the best teams.
"We would like to thank QPAD for the support they will give us."
Since Alchemists failed to apply for an invite to Copenhagen Games' main CS:GO tournament, the team will have to take part in the qualifier, which will be played on March 28th.
Alchemists will attend the Danish event next week with:
Marcus "Delpan" Larsson
Emil "FYRR73" Karlsson
John "hyvlarn" Edelsvärd
Alexander "rdl" Redl
Gunnar "zEn" Eng