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The former England captain wonders how the visitors will getinto a competitive mindset.
It was skipper Buttler who had pushed for players to get back in the English camp from the IPL to prepare for the T20 World Cup with the series against Pakistan.
Vaughan suggested England must carry out an honest review of their 1-4 mauling in India by taking a leaf out of Manchester City boss Pep Guardiola's book to breed an environment of ruthlessness.
Vaughan also criticised Rohit for not being proactive during the series-opener.
Vaughan's remarks come after India suffered a heavy defeat by an innings and 32 runs to South Africa within three days of the Boxing Day Test at the SuperSport Park in Centurion.
Rohit Sharma is currently the India captain in all three formats of the game, having taken over from Virat Kohli, but Pandya's on-and-off-the-field demeanour while leading Titans has impressed Vaughan.
Former cricketers lined up to slate Virat Kohli's Indian team after Sunday's crushing eight-wicket defeat by New Zealand left them on the brink of elimination from the Twenty20 World Cup.
“High-level sport is about getting over the line, winning trophies, particularly when you're at the standard of what Virat Kohli is at," Vaughan was quoted as saying by Cricbuzz.
He also felt that the tourists need to pick Ravichandran Ashwin for the fourth Test at The Oval and break free from a false sense of security given by the tailenders after winning the second Test at Lord's.
The former skipper said England's "batting line-up is fragile".
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