Jeremy Corbyn has filled four vacancies in his shadow cabinet following the Brexit vote.
The Labour leader appointed Rebecca Long-Bailey as shadow business secretary, Sue Hayman as shadow environment secretary, Christina Rees as shadow Wales secretary and Peter Dowd as shadow chief secretary to the Treasury
In total, 52 Labour MPs rebelled against Mr Corbyn's orders and voted against triggering Article 50 on Wednesday night.
A Government source warned peers not to delay the Bill's progress through the Lords.
"The Lords will face an overwhelming public call to be abolished if they now try and frustrate this Bill - they must get on and deliver the will of the British people," the source said.
Labour leader Jeremy Corbyn insisted that he has support from MPs on all other campaign issues and upcoming votes.
A total of 52 Labour MP's rebelled against their party leader's three-line whip for a second time to vote against Government's Brexit Bill.
Labour has called on the Government to set out its plans for immigration in post-Brexit UK.