Will Jacks believes England captain Harry Brook will "let the cricket do the talking" at the T20 World Cup.

England begin their campaign on Sunday against Nepal, while they will also face West Indies, Scotland and Italy in Group C.

They are the only country to have reached at least the semi-finals in each of the last four editions, winning the competition in 2022 and finishing as runners-up in 2016, when Carlos Brathwaite scored four consecutive sixes off Ben Stokes' bowling in the final to win the trophy for West Indies.

Ahead of the tournament, which will be co-hosted by India and Sri Lanka, Brook has come under fire after a confrontation with a nightclub bouncer in New Zealand last year, for which he has publicly apologised three times.

Brook was reportedly close to losing the white-ball captaincy over the incident, which came back into the spotlight when he admitted lying about other players' involvement to protect them.

But Jacks, who has been a long-time team-mate of Brook, has backed the England skipper to have a strong tournament in Asia.

"We go back a long way. We were room-mates together in the under-19s, so for him now to be captain is pretty cool for me to see," said Jacks.

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"Obviously, it's been a tough time that's been well documented in the media.

"I wasn't actually in New Zealand [Jacks missed the tour through injury], so I didn't know anything about it.

"He obviously made a wrong decision, but he's accepted that, and we're now trying to move forward in a positive direction with that. And he's obviously making amends on the pitch, and we will back him 100%.

"His kind of character is always looking on the brighter side of life.

"He knows what he's done, and there's nothing you can change about that, so there's no point focusing on it too much. From his perspective, he wants to let the cricket do the talking."

England prepared for the 20-over tournament by sweeping Sri Lanka 3-0, meaning they have won each of their last three T20I series.

However, despite their strong form, Jacks insisted that co-hosts and defending champions India are the favourites to lift the trophy.

"We come here full of confidence and belief, which is obviously very important. But that doesn't guarantee us anything," Jacks added.

"We know that there are amazing teams in this World Cup. Knock-out cricket, if we get there, is tricky.

"But India on home soil, I think everyone knows they're the favourites and the team to beat."