Lisa Nandy and Rachel Reeves promoted. Corbyn allies Ian Lavery, Barry Gardiner and Jon Trickett all removed from posts.
HuffPost UK revealed on Wednesday that the shadow cabinet minister was weighing up a bid for the top job.
Shadow international trade secretary has said he wants to "energise" the Labour leadership race.
Shadow international trade secretary and Corbyn loyalist has begun looking for a campaign team, HuffPost UK understands.
Shadow cabinet minister defends Jeremy Corbyn's handling of grilling by BBC's Andrew Neil.
"Wow. Can someone explain the news to Barry Gardiner again please?"
Exclusive: Lib Dems Send Activists 'Jeremy Corbyn Brexit Dossier' As Party Plots Assault On Labour Heartlands
Barry Gardiner telling the Tories "we're trying to bail you out" will be key quote on the doorstep.
That's not what Barry Gardiner said.
Brandon Lewis, Helen Whately, Barry Gardiner, Andrew Gwynne, Rebecca Long-Bailey and Jo Swinson on the pre-election TV tour.
Labour MPs Pushing For Referendum On Any Brexit Deal Trying To 'Change Party Policy,' Says Barry Gardiner
Party's European elections manifesto to be agreed on Tuesday.