The Labour party could pay a high price for campaigning to Remain in the EU, according to long-standing MP Kate Hoey.
Hoey, who is co-chair Labour Leave, said that many Labour voters who back Brexit could end up leaving the party for good as a result of its stance on the EU.
"I think we will find that Labour supporters will not have been listening to the Labour leadership on this," Hoey told Sky News
Hoey added: "Across the country thousands and thousands of Labour supporters abandoning the Labour view on this because we've known for a long time being out there that the Labour party view on this is out of step with Labour supporters, and ex supporters who I'm afraid probably won't come back to us after the Labour leadership fought this campaign of staying in."
Speaking about Labour leader Jeremy Corbyn's pro-EU credentials, she said: "It has been quite interesting to be not on the same side as Jeremy on anything to do with the EU because of course for the 27 years I've been in parliament we've been in the same lobby."
But, Hoey continued: "I've always said that he's leader now and had to make decisions based on wanting to keep the party together. But most of the things he said with the EU I agree with; he said it's dysfunction, it's got corruption, it's neo-liberal."
"The key difference is he thinks the EU can be reformed, I don't think it can be reformed."
A number of Labour MPs had previously told City A.M. that by campaigning to stay in the EU a number of its supporters would defect to the UK Independence Party.
In the north of England both Labour and Conservative MPs said they had seen support shift to Ukip during the general election.
Speaking tonight, Nigel Farage said: "The eurosceptic genie is out of the bottle and it will now not be put back. But perhaps even more remarkably the biggest change from this referendum i snot what has happened in the UK, it is what has happened across the rest of the EU.
"We've seen now in Denmark, the Netherlands and even Italy, up to and around 50 per cent of those populations want to leave the EU."
He added the government's registration scheme, and an extension of voter registration, is what has informed "his sense" that the UK will vote to Remain, and that if that is the case another country will leave the EU before the UK.