Owen Smith is to pledge to fight for workers' rights and trade union powers in his latest pitch to Labour supporters ahead of the leadership election.
He will say that the UK has "become the poor man of Europe for job insecurity and workers' rights".
However, in response to Smith's speech, a spokesperson for the Jeremy for Labour campaign said they welcome "Owen's focus on equality of outcome reindustrialisation and workers' rights - and his support for policies announced in recent months by Jeremy Corbyn and John McDonnell".
"We are delighted that he has echoed McDonnell’s call for the reinstatement of a Ministry of Labour, made last month at the Institute of Employment Rights, and Corbyn's call for a ban on exclusive workforce recruitment from abroad, made during the referendum campaign, among other policies," the spokesperson added.
Going even further, Corbyn's team says that Smith's speech shows the leadership Corbyn has demonstrated in placing economic justice and fairness back at the heart of Labour politics.
"Under Jeremy, Labour has put restoring dignity and pride in our communities worst hit by decades of neglect at the core of our politics."
Smith is challenging Corbyn for the Labour leadership after Corbyn lost a vote of no confidence in the Parliamentary Labour Party by nearly 80 per cent.
That itself followed what many thought was a lacklustre EU campaign by the Islington North MP and fears that he would not be able to win a general election.
In addition, recent polling also shows that Corbyn is set to trounce Smith in the challenge.
However, some 183,000 registered members joined in a 48-hour window last week, with speculation that most joined to support incumbent Corbyn.
The contest that will be decided on 24 September, with the first hustings scheduled for 4 August in Cardiff.