Udom Puasakul has decided to quit as TOT chairman after only nine months in the role, saying he has failed to adequately perform his job.
Mr Udom said he had evaluated his own performance at the state-owned telecom company and could only give himself "four out of 10".
Mr Udom had previously served as director-general of the Department of Public Works and Town and Country Planning. He is seen as having a good relationship with Yaowapa Wongsawat, a sister of ousted prime minister Thaksin Shinawatra.
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