Pietersen's extra net session to combat left-arm spinner weakness.
Pietersen was dismissed for the 19th time in his past 61 Test innings by a left-arm spinner when he fell lbw to Sri Lanka's Rangana Herath for three.
The 30-year-old was jumpy and tense when he faced Herath, who failed to trouble the rest of the England batsmen, The Telegraph reports.
He was the only top order batsman to miss out as England piled up 496-5 declared.
Earlier, in Bangladesh last year, Pietersen had spent hours working in the nets against left-arm spinners and it reaped scores of 99, 45 and 74 not out in the Test series. (ANI)
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