"I think overconfidence was the primary reason for the defeats," Razzaq said on 'Geo Super' channel.
Razzaq, who was ignored for the South Africa series despite his vast experience, said Pakistan -- after doing well in Tests in the last two years in the UAE, Sri Lanka and India -- were not prepared for the conditions in South Africa.
"I thought they were a bit overconfident about this series after doing well in the last two years against most teams. Unfortunately they were not ready for an informed South African pace attack," he added.
He also felt that another reason for the debacle was the absence of experienced players in the team.
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"When I went to South Africa for the first time I had senior players like Wasim, Waqar, Inzamam, Rashid Latif, Moin Khan, Saeed Anwar to guide me and I did well there by reducing my backlift. On this tour, unfortunately the team missed seniors," he said.
He pointed out that Younis Khan was the most senior Test player in the side while Umar Gul was the most experienced bowler.