The ferries, due to leave from Portsmouth Harbour at 10.15am and 11.15am, and Ryde Pier Head at 10.45am and 11.45am, have been taken out of service for technical reasons.
A spokeswoman for Wightlink said: 'Wightlink would like to apologise for any inconvenience this may cause.
'Passengers concerned about their sailings should call Wightlink reservations on 0871 376 1000.'
Delays are also expected on other Wightlink ferries.

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