Non-essential domestic and international travel should be "strongly discouraged", according to the European Union.
It is proposing a more co-ordinated approach to travel restrictions across the bloc due to the emergence of Covid-19 variants.
Meanwhile, the Chief Medical Officer has criticised ads encouraging people to book summer holidays - describing them as not very responsible.
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Ryanair have been running a campaign with the tagline "jab and go" as part of efforts to sell seats.
Dr Tony Holohan says he'd welcome "every possible deterrent" to stop people travelling in and out of Ireland - and urged people to do the responsible thing.
