Buttler and Mott led England to the 2022 T20 World Cup title in Australia however endured a disappointing 50-over World Cup in India final yr, profitable solely three of their 9 matches.
They have been then thrashed by eventual champions India within the semi-finals of the T20 World Cup within the Caribbean in June.
England have been crushed 2-1 by West Indies within the one-day worldwide sequence, with defeat within the decider their twelfth in 18 ODIs.
Buttler has been out injured for 4 months however mentioned that absence made him “decided” to guide England’s newest white-ball reset.
“I simply need to be current and assist develop the following period of white-ball cricket and simply actually, actually get pleasure from this a part of my cricket,” he added.
“Once you get an harm like that, it makes you realise how desperately you need to get again.”
McCullum mentioned a part of his position is to cheer up Buttler, who he mentioned had been “depressing” at instances throughout England’s latest limited-overs troubles.
“It’s clearly one thing I must work on,” mentioned Buttler.
“I’m actually enthusiastic about him taking up. You’ll be able to see the impact he is had on the Check group and the entire narrative round English cricket. He was at all times somebody I might have cherished to play in a group with and now there’s a tremendous alternative to work with him as a coach.”
Buttler will likely be a specialist batter for the T20 sequence, with Phil Salt remaining as wicketkeeper, whereas Marcus Trescothick continues as interim head coach.
Buttler mentioned he made the choice to surrender the gloves with McCullum, who did the identical throughout his profession to concentrate on his position as New Zealand captain.
“When he moved to be near the bowler, he discovered it extremely helpful and a terrific place to captain from,” mentioned Buttler.
“I am open to one thing if it’ll be good for me, good for the group. I am fairly joyful fielding. There are pluses and minuses to each.”
West Indies have introduced a 15-man squad for the primary two T20s, with seamer Matthew Forde changing Alzarri Joseph, who’s serving a two-match suspension for leaving the sphere after arguing with Shai Hope throughout the third ODI.