Blais, who was recalled from the San Antonio Rampage on Monday, will also be in the lineup.
"I've been hearing very good things about his play," Yeo said. "The offensive side of things, he's been very dynamic and very dangerous."
Yeo also said Sundqvist would play following his conditioning stint in the AHL.
Vladimir Sobotka, who is sick, will not be in the lineup.
The Blues held an optional morning skate on Tuesday, so it wasn't possible to see the lines the club would use against the Sharks. As a result, here is a guess at the lineup based on Monday's team practice and the personnel changes Yeo announced on Tuesday morning.