From Mark Stepneski of Stars Inside Edge:
Lehtonen suffered a “mild” concussion Monday versus the Panthers.
Gonchar apparently took a puck off his ankle Tuesday versus the Lightning.
The Stars are also, of course, without defenseman Brenden Dillon, who has yet to agree upon a contract.
The Gonchar injury leaves them with just six healthy d-men on the roster — Trevor Daley, Alex Goligoski, Jordie Benn, Kevin Connauton, Patrik Nemeth and Jamie Oleksiak.