The Labour Party are set to implement a rule change which would allow a leftwing candidate to succeed Jeremy Corbyn.
Sources have told The Guardian the national executive committee are prepared to accept the McDonnell Amendment, which would reduce the required percentage of MPs and MEPs needed to select candidates for leadership elections from 15% to 10%.
It would also free up the rules to allow for a greater variety of candidates to try their hand.
There is also discussion about allowing a number of representatives from trade unions and of party members to sit on the committee.
A few people, like Richard Angell of centrist group Progress, have questioned the need for the amendment.