PKR president Anwar Ibrahim has accepted former premier Najib Abdul Razak's challenge for a debate on the financially-troubled Sapura Energy Berhad.

Taking to Facebook, Anwar said his stand remains unchanged since he first challenged Najib to a debate on the economy over a decade ago, which ultimately did not happen.

Rafizi previously claimed Najib was "afraid" after the Pekan MP set a condition for both of them to take their social media sparring on Sapura's financial state into a real debate.

Najib had said he was prepared to accept the debate challenge but added that the PKR vice-president must bring his "boss" along.