Perron won't be available Saturday against the Senators, as he's day-to-day with an upper-body injury.

After Saturday, the Blues will have two more games to play before the All-Star break, with Monday's road clash with the Kings standing as Perron's next chance to suit up. Eighth-year winger Jordan Nolan figures to slot into the lineup for the time being, while Patrick Maroon more directly replaces Perron in the top six with Ryan O'Reilly and Vladimir Tarasenko.

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