Goalkeeper Dustin Strahlmeier (Wolfsburg), defender Mario Zimmermann (Straubing) as well as strikers Tarro Jentzsch (Iserlohn) and Alexander Karachun (Schwenningen) have so far been missing on the official list that the World Association IIHF published on Thursday evening.
Söderholm can continue to fill up his squad in the course of the tournament.
The 44 -year -old Finn also hopes for possible reinforcements from North America.
In view, the national coach Ahl defender Leon Gawanke, should he leave the play-offs early with Manitoba Moose.
Lukas Reichel (Rockford Ice Hogs/Ahl) and John-Jason Peterka (Rochester Americans/Ahl) could theoretically become still available.
NHL top star Leon Draisaitl is probably not an issue for the Deb even in the event of an early season.
Germany starts the tournament on Friday in Helsinki (7.20 p.m.) as an outsider against record world champion Canada, who is at the start with numerous NHL players.