Former shadow minister Chuka Umunna - once a favourite to replace Ed Miliband as Labour leader - has dismissed reports that he was being lined up to challenge Mr Corbyn before the next general election.
"This issue of the leadership is settled, we don't need to be talking about this any more," the Streatham MP told the BBC's Andrew Marr Show.
"We need to be working out how we win the next general election, because that's the way we put our values into practice."
Mr Umunna warned that Labour can only win an election as a "broad church" and cautioned against any move to punish those who have rebelled against Mr Corbyn.
"We've got to move on from this notion of crushing people who disagree with us," he said. "The strength of the Labour Party is that it is a broad church. Under our first-past-the-post electoral system ... you can only win if you are a broad church political party, and for the Labour Party you have to take in everyone from the left to the centre-left. If we don't do that, we are not going to be able to heal the divisions in society."