Steen, who leads the Blues with 20 goals and is second to Washington Capitals forward Alex Ovechkin (21) for the NHL lead, will be a game-time decision when the Blues (19-5-3) host the Anaheim Ducks (19-7-5) in a battle of Western Conference heavyweights Saturday night.
It started when forward Chris Stewart was the first to get sick when the Blues visited the Buffalo Sabres, but he played. Defenseman Kevin Shattenkirk missed the Nov. 25 home game against the Minnesota Wild because of illness, and left wing Magnus Paajarvi sat out a 3-2 loss Monday against the Los Angeles Kings.
"Same rules ... doesn't feel well, stay home, stay away from the rest of us," Blues coach Ken Hitchcock said of Steen, who leads the team with 32 points in 27 games. "Everybody else has been able to play that's been sick.
"We'll see how he feels later in the day. Rather than infect the rest of us, he didn't feel well and just stayed home."