Marchessault scored a goal on three shots in Saturday's 3-2 loss to the Avalanche.
Marchessault gave Vegas a 2-1 lead in the first period, scoring on a feed from Reilly Smith. The 31-year-old winger missed Friday's game due to an illness, but he was able to return after a brief absence. Marchessault has 21 goals, 36 points, 154 shots on net and a minus-3 rating in 47 contests this season. Now healthy, he'll resume his usual second-line role.