Southampton, Sept. 14 -- England white-ball coach Brendon McCullum has said that he wants the team's newly-appointed specialist mentor and former cricketer Kevin Pietersen to "challenge" him privately on ways the team can improve and do things differently, as he starts his stint from the white-ball series against Sri Lanka starting this week.

The former England legend, who cracked 13.797 runs in 277 international matches, including 32 centuries for England from 2004 to 2014 and played a crucial role in their T20 World Cup 2010 triumph with a 'Player of the Tournament' worthy performance, will start his stint as team's specialist mentor till 2027 ODI World Cup and will work with them in most of the series starting with the home Sri Lanka ...