Trineyev scored twice in AHL Hershey's 6-1 win over Texas on Sunday.
Trineyev has three goals over four games to begin the season. The Capitals have a strong NHL group of forwards and a number of prospects in the AHL as well, so he'll need to be at his best to stand out. He earned 45 points in 62 regular-season games last year as well as making two appearances with the big club in a bottom-six role.