And the
lure of shadow cabinet elections - which Corbyn has promised to re-introduce - could well prove irresistible to a number of junior ministers and wannabe ministers.
Some Labour MPs are looking for a more categorical denunciation of threats to deselection and the return
of shadow Cabinet elections before they will consider a frontbench role.
Labour leader faces backlash from his MPs for disregarding vote in favour of shadow cabinet elections
A spokesman for Mr Corbyn insisted the
issue of shadow cabinet elections will still be discussed in a special meeting of party chiefs next month to agree the wider rule changes.
The issue
of shadow cabinet elections was kicked into the long grass by Mr Corbyn at a key meeting of Labour's ruling NEC last week after he said it should be given more time.
But senior frontbenchers say the price of working with Mr Corbyn would be the return
of shadow cabinet elections, giving MPs the power to elect a substantial number of Labour's top team.