Tiefensee (upper body) will miss Monday's preseason contest against the Blues, per Owen Newkirk of DLLS Sports.
Blackwell is dealing with a lower-body injury but should return before Opening Night, Robert Tiffin of NHL.com reports Monday.
DeSmith will draw the start during Monday's preseason game at home against the Blues, Sam Nestler of DLLS Sports reports.
Steel signed a four-year, $14.8 million contract extension with the Stars on Monday.
Walman said Wednesday that he focused on his conditioning during the offseason, Jason Gregor of Sports 1440 Edmonton reports.
Gleason signed a professional tryout agreement with the Stars on Wednesday.
Janmark (undisclosed) will skate during training camp but won't appear in preseason games, Jason Gregor of Sports 1440 Edmonton reports.
Regula (undisclosed) is expected to skate during training camp but won't participate in any preseason games, Jason Gregor of Sports 1440 Edmonton reports Wednesday.
Schmidt continues to deal with the flu and may not be ready for the start of camp, Sam Nestler of DLLS Sports reports.
Bertucci isn't ready for the start of training camp because of an undisclosed injury, per Sam Nestler of DLLS Sports on Wednesday.
