The Steam Packet Company is warning of possible disruption to services because of strong winds.
It says the Manxman's 7.30pm Douglas to Heysham sailing is at risk, as well as her return voyage at 1.45am on Monday.
A final decision on both crossings is expected by 5.30pm on Sunday.
The Met Office says Sunday may see strong winds around the Irish Sea.
What help is there for using government online services?
What support is there for people outside Douglas who need help using government online services?
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