Figures from pollster ICM yesterday showed his party trailing the Conservatives by 13 points at 28 per cent to the Tories 41 per cent.
According to political forecasting website Electoral Calculus, if this support was replicated across the country it would cost Labour a total of 37 seats.
The figures come as the Boundary Commission's initial proposals moot wiping Corbyn's constituency off the map.
Corbyn's seat of Islington North could be merged with those of Emily Thornberry in Islington South and Diane Abbott in Hackney North and Stoke Newington, but the process will create just two new seats.
And under current party rules, both Thornberry and Abbott are considered to have a stronger claim to the new constituencies – meaning Corbyn could be left fighting for a spot at the next general election.
The boundary plans, revealed this morning, show a loss of 32 seats across England, with Labour heartlands like London set to be among the worst affected.
London will lose five seats under the current plans, and last night the Electoral Reform Society said that two of those would go because the Commission is bound by statute use the 2015 electoral roll, rather than more recent data from this year.
ERS figures show that five of the top 10 most under-represented areas, where the electorate has grown most between December 2015 and June 2016, are in London.
And regions were Labour enjoyed its greatest successes in 2010 like London, the North East, the North West and Yorkshire are set to see the biggest reductions.
Labour shadow minister without Portfolio Jon Ashworth said: “The current proposals to redraw constituency boundaries are unfair, undemocratic and unacceptable. They are based on an out-of-date version of the electoral register with nearly two million voters missing.
He added: "These changes are not about fairness to voters, they are about what is best for the Tory Party and they must not go ahead. The commission must rethink and ensure that no elector loses out.”
However, Labour will not be the only ones to lose out – former chancellor George Osborne's Cheshire seat of Tatton could be split between Graham Brady, chair of the Conservatives backbench committee and Macclesfield MP David Rutley.
The changes will be implemented for the general election due in 2020, but with final proposals not expected until October 2018.