Fellow center Lehtera, recovering from flu, should be ready Thursday.
Rookie shared the lead in shots on goal Sunday with four.
He was replaced in Sunday's game by forward Magnus Paajarvi.
Short-handed team was flat as eight-day road trip ends on a sour note.
Sami Vatanen scored two power-play goals to lead Anaheim.
It was a busy day for all NHL teams. The Blues did not have a first round selection (it was lost in the trade that brought Chris Stewart and Kevin Shattenkirk to the organization), but the Blues still had 8 draft picks to select.
Here is the skinny on what the Blues did during draft weekend:
32nd overall draft pick: RW Ty Rattie
41st overall draft pick: RW Dmitrij Raskin
46th overall draft pick: D Joel Edmundson
88th overall draft pick: G Jordan Binnington4th round
102nd overall draft pick: LW Yannick Veilleux
132nd overall draft pick: G Niklas Lundstrom
162nd overall draft pick: C Ryan Tesink
192nd overall draft pick: D Teemu Eronen
For information on each of these draft picks, please visit stlouisblues.com’s draft page.