All P&O Ferries contracts across government will be reviewed in response to the way it sacked 800 workers.
Staff have been protesting after many were told without warning by video message on Thursday that it would be "their final day of employment".
In a letter to the company, Transport Secretary Grant Shapps said he was "deeply concerned" at the move and questioned whether it was legal.
P&O said it was a "last resort" to save the business.
Passengers have been left stranded with services cancelled since the announcement.
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