This was revealed by Noel Mooney, General Manager Football Association of Ireland (FAI).
The optimism of a successful joint bid was as a result of an encouraging outcome of an English-led feasibility study.
In their proposal, Wembley will host the 2030 FIFA World Cup final, while matches will take place in Cardiff, Dublin, Glasgow and various cities in England.
There is ample time for further logistical assessments as FIFA has outlined plans to select the winning bid in 2024.
Speaking to The Times, Mooney said: “The feasibility study is positive and there’s a sense that the right thing to do is go forward.
“This bid is out on the front foot and very well led by the guys from the English FA who gave a very strong presentation.
“It’s a chance to get a really credible bid and hopefully win it.
“I’d be very surprised if there’s not a very credible bid from Great Britain and Ireland.”
The England’s FA mounted failed attempts to host the tournament in 2006 and 2018, which went to Germany and Russia respectively.
Also multiple joint bids are expected from Morocco, Algeria and Tunisia, while Argentina, Chile, Paraguay and Uruguay will also bid to co-host it in South America.
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