England white-ball head coach Brendon McCullum says he wants newly appointed mentor Kevin Pietersen to challenge his methods. Pietersen criticised England players during last year's India tour. "That was one of the first things we talked about," McCullum told BBC Sport. "He said 'gee, I was just criticising you not long ago'. I said I don't care about that. Some of it's fair and some would need explanation, but I have no problem with that. It's healthy when you create an environment where you're able to challenge."

Pietersen joined the limited-overs set-up as a specialist mentor until next autumn's 50-over World Cup in South Africa, Zimbabwe and Namibia. He linked up with the squad on Sunday before the first of three T20s and three ODIs against Sri Lanka in Southampton on Tuesday. McCullum said Pietersen was "shocked" when first called about "helping us challenge for a World Cup" and was "unbelievably enthusiastic".

"The energy he's brought to the group already has been immense," said McCullum. "He was a brilliant cricketer, viewed the game differently, was a winner and left no stone unturned in preparation. A lot of these guys grew up watching Kev play and idolised him."

England will hand a debut to Derbyshire opener Aneurin Donald in the first T20, with Phil Salt missing through injury. Jofra Archer is rested, but Josh Tongue is included. McCullum's sole responsibility is now the white-ball side after he was sacked as Test coach following the series defeat by New Zealand in June. Stephen Fleming has been appointed to the role.