Halak had been on the injured reserve list since Feb. 1 and was activated before Monday's game against the Los Angeles Kings, which he was scheduled to start.
But he aggravated the groin during the pre-game warm-ups and was replaced by Brian Elliott, who allowed four goals on 23 shots during a 4-1 loss.
The team said Tuesday the netminder was "day-to-day" with a strained groin.
Halak had compiled a 3-0-0 record in five starts prior to the original injury, including a pair of shutouts.
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