Finland go into the final pair of Group D games in third, a point behind Ukraine in second, with a game in hand, and four points behind group leaders, France.
Markku Kanerva's side first travel to the Bilino Polje Stadium, Zenica, to take on Bosnia and Herzegovina on Saturday 13 November, kick-off 2pm. Bosnia themselves still harbour qualification hopes, sitting a point behind Finland in fourth.
The Eagle Owls then return to home soil to take on Les Bleus at the Helsinki Olympic Stadium on Tuesday 16 November, kick-off 7.45pm. Marcus and his teammates will also have one eye on Zenica at the same time as Bosnia and Ukraine face each other.
The group winners will qualify automatically for the 2022 FIFA World Cup while the runners-up head into the Play-Off round to be held next March.
Marcus missed October's round of qualifiers due to injury. The 22-year-old has played nine times for his nation, scoring on his debut against France last November.
At club level, Marcus has five goals in seven outings so far this campaign. He is the Carabao Cup's top scorer with five goals in three appearances, including four against Oldham Athletic, and made his first Premier League start last weekend away at Burnley.