The Department of Infrastructure says contractors need more time to carry out work at the Liverpool ferry terminal.
It says work to adjust the fenders at the terminal has been extended, which will impact more sailings.
The weekend crossings on Saturday, November 8 and Sunday, November 9 will be now be affected, along with those on Saturday, November 1 and Sunday November 2, which had already been impacted.
The department says once the work is complete, the Manxman will be able to dock at the berth no matter the state of the tide.
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