England limited-overs skipper Eoin Morgan has accused Alex Hales of "complete disregard" for team values following the opening batsman's exile from England's World Cup squad.
Hales was dropped from all England squads, including the preliminary World Cup 15, after reportedly failing a drug test for recreational drugs for a second time.
England decided to drop Hales after a report of a 21-day ban from cricket was published in the Guardian.
The ECB insisted they could not go public with details because of their own rules regarding the handling of drugs offences. This means Morgan, chief selector Ed Smith and coach Trevor Bayliss were unaware of the issue when England's squad for the World Cup was named.
"Unfortunately Alex's actions have shown complete disregard for those (team) values," Morgan said ahead of England's one-off ODI against Ireland in Malahide. "This has created a lack of trust between Alex and the team.
"On Saturday, we got together as a group of senior players to discuss the effect the news coming out would have on the team and the culture.
"We all agreed the best decision for the team was for Alex to be deselected. I relayed this to Ashley Giles, because we don't have final say, I can only give the view in the changing room and how guys feel. I think we've dealt with it really well."
England have adopted an increasingly hardline approach since the late-night incident in Bristol, where Hales was present, that eventually saw Ben Stokes cleared on a charge of affray.
"We've worked extremely hard on our culture in the last 18 months since the Bristol incident," said Morgan.
"We will need at least 15 men to win the World Cup and, whatever way Alex would have dealt with it, the other 14 people would have been dragged down and that would have been quite a weight taken forward."
Giles was just one of three people in the ECB hierarchy who had to be told of Hales's incident. He insisted Thursday Hales could return to England duty, saying "the door isn't closed whatever people think".
"But what we want to see is some really good behaviour over time and some good cricket, of course."
Giles dismissed a statement issued by Hales's representatives saying the ECB had reneged on assurances his World Cup place was safe.
"Neither myself nor (ECB chief executive) Tom (Harrison) would lie, mislead or cover up what went on or make a U-turn...we didn't. Tom and I can't make guarantees on selection, because we're not selectors," said Giles.