Labour MPs have been told they will be automatically re-selected as candidates in their constituencies for the general election on 8 June.
Jeremy Corbyn had hoped to give party members a say in who was chosen, but has accepted there is insufficient time to do that before polling day.
However, one Labour MP has told Mr Corbyn there is still time for him to stand down as leader before the vote.
Labour will endorse the PM’s call for a snap election in a Commons vote later.
Mr Corbyn welcomed the prime minister’s election announcement on Tuesday, calling it a “chance to vote for a government that will put the interests of the majority first”.
After a meeting of Labour MPs and peers on Tuesday evening, a source close to the party leader said there had been a “clear consensus… to support the triggering of an election”.
But BBC political correspondent Chris Mason said Mr Corbyn himself had been met by only cool applause from the room.
Afterwards, one MP was heard to say: “Go back to your constituencies and prepare for… the Guardian jobs page.”
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Earlier, in a video, John Woodcock, the Labour MP for Barrow-in-Furness, said there was still time for Mr Corbyn to stand down “rather than lead Labour to defeat”.
In the Facebook video, Mr Woodcock, a long-standing critic of Mr Corbyn, said he was seeking re-election in his constituency, but could not endorse Mr Corbyn as the next prime minister.
The Labour leadership has insisted there is “a very positive mood” in the party and it looked forward to presenting “a real alternative” to the Conservatives.
Former Home Secretary Alan Johnson has said he will not be seeking re-election in the Hull West and Hessle seat he has represented since 1997.
And Tom Blenkinsop, who has been MP for Middlesbrough South and East Cleveland since 2010, said he would not be standing for re-election, citing “irreconcilable differences” with the party’s leadership.
General election: Labour MPs will not require re-selection}