The Blues were missing two significant pieces to their forward corps at Wednesday's practice, but are hopeful both will be available to play against the San Jose Sharks on Thursday.

Alexander Steen and Vladimir Tarasenko were absent from practice at Scottrade Center.

Steen was the obvious one after he smacked the back of his head against the corner glass after engaging for a puck battle with Buffalo Sabres defenseman Josh Gorges.

Steen would leave the game twice in the second period, finish it but did not return for the third in a 4-1 victory against the Sabres.

Photos: Vladimir Tarasenko 2016

Tarasenko, who extended his points streak to six games (two goals, six assists) was apparently dinged up during the game, too, but was able to finish it.

Coach Ken Hitchcock said both were given maintenance days for the full practice.

"Both (Steen) and 'Vladi' were given maintenance days today," Hitchcock said. "Hopefully we'll have them both in the lineup tomorrow, fresh and ready to go.

"(Tarasenko) needed a maintenance day today. Both guys needed it. We decided to switch it up and have a full practice today and it wouldn't have done them any good, so get them ready for tomorrow, both guys."

In their respective spots, Dmitrij Jaskin moved up from the third line to take Steen's spot with Jaden Schwartz and Paul Stastny, and Ty Rattie filled the hole left by Tarasenko with Robby Fabbri and Jori Lehtera.

Nail Yakupov, a healthy scratch Tuesday, moved into Jaskin's spot with David Perron and Patrik Berglund.