FTSE 100 bosses will this week issue a last minute rallying cry for the Remain campaign ahead of Thursday's referendum

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With Britain heading to the polls on Thursday, will the intervention from FTSE bosses come in time to have an impact on the EU referendum? (Source: Getty)

FTSE 100 bosses are preparing to provide last-minute backing for a Remain vote ahead of this week's referendum.

Remain campaigners are this week preparing to publish a letter from chief executives lending their support to the EU.

City A.M. understands that signatories will include RSA chief executive Stephen Hester, while the Sunday Times has reported that Barclays chairman John McFarlane has also signed up.

Barclays and RSA declined to comment.

The letter is being co-ordinated by Britain Stronger in Europe's Gabe Winn, who previously ran communications for British Gas parent, and FTSE 100 member, Centrica Energy.

Read More: The definitive list of everyone who's ever expressed a view on Brexit

A spokesman for Britain Stronger in Europe said: “The campaign to keep Britain in Europe’s 500m-strong free trade single market has been backed by the vast majority of businesses, large and small.

“We are confident more and more businesspeople will continue to speak out in the final days of this campaign to say that being in creates jobs, boosts trade, and attracts investment.”

Business leaders stress in the letter that EU membership is good for business and jobs.

It comes after James Dyson lent his support to the Leave campaign. Dyson, who has long been a critic of UK immigration rules, argued that EU membership restricted the ability of employers to recruit high quality staff from other parts of the world.