Rosena Allin-Khan
MP for Tooting since 2016 by-election
Current nominations: 3
Verdict: Unlikely to gather the required 22 nominations to proceed
Richard Burgon
Born: Leeds, 1980
MP for Leeds East since 2015
Current nominations: 8
Verdict: Will be the favoured candidate of the hard left and could spring a surprise
Dawn Butler
Born: London, 1969
MP for Brent Central since 2015, also Brent South (2005-10)
Current nominations: 4
Verdict: May struggle to gather the required nominations, but won't pose a threat if she does get on the ballot paper
Khalid Mahmood
Born: Pakistan, 1961
MP for Birmingham Perry Barr since 2001
Current nominations: 1
Verdict: Won't gather enough nominations to proceed
Ian Murray
Born: Edinburgh, 1976
MP for Edinburgh South since 2010
Current nominations: 6
Verdict: Vehement Corbyn critic, but as Labour's only Scotland MP he could gather plenty of PLP nominations north of the border - if he can get past this first stage. Third place behind Rayner and Burgon.
Angela Rayner
Born: Stockport, 1980
MP for Ashton-under-Lyne since 2015
Current nominations: 30
Verdict: Has already surpassed the required nominations to proceed to the next stage and will be the clear favourite. Unison has already backed her, opting for a Starmer/Rayner leadership. Rayner herself is backing her pal Long-Bailey for the top job.