Carr took over the Dragons' training on Tuesday morning, just hours after Anthony Griffin was axed by the club.
Determined to show a united group, the Dragons twice embraced in a team huddle in the opening 15 minutes of the session on the outside field at WIN Stadium in Wollongong.
Carr formed part of that address, vocal in the early stages of life without Griffin at the helm.
His influence will be immediate.
AAP has been told that Lomax is set to be named to face the Sydney Roosters on Friday evening, when teams are announced on Tuesday afternoon.
Dropped a fortnight ago, Lomax was left frustrated by a lack of feedback from Griffin.
The centre starred in reserve grade on the weekend against Newcastle, and is now expected to return to the NRL side.
Hooker Jacob Liddle is also expected to earn a recall, after also being dropped a fortnight ago.
Having only arrived at the Dragons during the off-season, Carr most recently served as Parramatta's attacking coach in 2022.
Once a contender for South Sydney's No.7 jersey at the start of Adam Reynolds' career, Carr's biggest coaching job prior to Tuesday was with Featherstone Rovers in the English second-tier Championship.
He won 21 of 35 games in charge of the club in 2019, and took the Rovers to within 80 minutes of promotion in the playoff against Toronto.
He then returned to Australia via the Eels' NSW Cup side, before moving into an assistant role last year.
Carr has been Griffin's left-hand man all year, sitting with him in the coach's box while fellow assistant Ben Woolf wore the headphones on the sideline.
The 34-year-old's appointment is only likely to be short-term, with Jason Ryles or Ben Hornby tipped to have the top job next year.
But in Carr, the Dragons need a man who can steer the team through a difficult four months ahead.
Speaking prior to his appointment, players backed Carr to do the job.
"If that's the decision they make, he's been fantastic as an assistant coach," forward Jack de Belin said.
"So has Ben, they've done a fantastic job.
"It's disappointing that we haven't given them the results that they deserve and the recognition."
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