United slipped to their 25th defeat in 31 Premier League outings when they were beaten 3-0 by Arsenal last night, a result which leaves them 18 points adrift of safety with only seven matches remaining.
Although Heckingbottom conceded United contributed to their own downfall against the visitors, who were previously without a clean sheet since January, he explained why his criticism will remain behind closed doors.
“We do criticise each other in there, the dressing room,” Heckingbottom told The Star. “We know where things are going wrong and what people are saying.
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“We are in a profession, where if you are a player or a manager, people are always going to have an opinion on you and what you are doing. There’s enough people talking and having a pop outside of the building, which we understand and accept.
“But in there, we also stick together. We are truthful and honest. But we stick together, including when we step outside of it.”
Alexandre Lacazette scored twice, either side of a Gabriel Martinelli effort, as Arsenal cruised to victory, Martinelli’s strike came following a mistake by John Lundstram, who gifted possession to the Londoners.
The result will lead to further calls for United to intensify their search for Chris Wilder’s permanent replacement, with Alexander Blessin of Opostende and Slavisa Jokanovic, previously of Fulham and Watford, also thought to be under consideration.
“It was disappointing.,” Heckingbottom said. “The scoreline seems harsh, but the margins are so fine. I thought we had our strongest moments just before their second goal, and that took the wind out of our sails.”
"We made some changes, to try and get higher up the pitch and to make a difference,” he added. “They had that effect and then what happened happened, which made a big difference because goals change the complexion of games more than anything else in football.”