The Swedish team had been scouring the market for new players after parting company with Tonoy "Lox" Prince and Jerry "xelos" Råberg, both of whom went on to create a new team with former WRTT team-mates Gustav "KAB0M" Runemalm and Joel "emilio" Mako.
Kjellberg and Lundberg had both joined Epsilon's account on the ESL's website as the team were signed up for the fourth EMS One cup before being disqualified from the tournament for cheating.
Epsilon have now given the team a vote of confidence by formally announcing that the two players have joined the squad on a permanent basis.
Kjellberg was a free agent after being released by Lemondogs earlier in the month following the team's disappointing campaign at Mad Catz, while Lundberg had been without a home since the disbandment of Western Wolves in December.
"Since my departure from Lemondogs, I have been looking for a new lineup and when Epsilon asked me I didn’t have to think twice about joining them," Kjellberg told Epsilon's website.
"I hope to bring good results under the Epsilon banner and I think we will do really good at tournaments like CPH Games, NLAN and Svecup."
Epsilon have signed up for Copenhagen Games later in March but will have to play the event's qualifier after failing to receive an invite to the main tournament.
The Swedish team's lineup is now comprised of the following players:
Jesper "jw" Wecksell
Robin "flusha" Rönnquist
Andreas "schneider" Lindberg
André "berg" Kjellberg
Jonathan "devilwalk" Lundberg