25-year-old Piedt, who is playing only his second Test, took four wickets on the opening day of the fourth and final Test and Manjrekar said he is a good find for South Africa.
"Dane Piedt seems to be a good find for South Africa. I think the visitors made a mistake by not playing him earlier in the series. He seems to be an accurate bowler and if there is some purchase for the spinners from the pitch, he can trouble the batsmen," he said.
"I think the Kotla pitch has been the best in the series. There is not as much turn as Mohali and Nagpur and there is some help for the fast bowlers too which was evident with the use of short balls by Morne Morkel," he said.
"The highlight of day-one was the way the visitors bowled. Kyle Abbott bowled with a lot of discipline. He bowled a strict line outside the off-stump."
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He was disappointed with India's collapse but praised Ajinkya Rahane for anchoring the Indian innings with an unbeaten 89.
"Ajinkya Rahane was the star for India and he controlled the innings.