McNamara has quit his role as assistant coach at the New Zealand Warriors in order to take the reins at the Stade Gilbert Brutus on a two-and-a-half-year contract.
He was initially with Sydney Roosters and more recently with the Auckland-based Warriors but he will give up that role, and the one of assistant to New Zealand head coach David Kidwell, to take up his position in France.
Jerome Guisset and Michael Monaghan will both remain as part of McNamara's coaching staff as assistants.
"We would have loved Steve to remain until the end of this season but we dont want to stop him being able to take up a position like this", Doyle said.
McNamara became assistant coach to Trent Robinson at Sydney after the 2013 World Cup and he joined the Warriors for the start of the 2017 season.
"I've loved my time working with the Vodafone Warriors and the Kiwis but the opportunity to take up a head coaching role has suddenly become available", he said.
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"He is an experienced coach who will add experience to the overall team, so we will now just reopen the process to ensure David has the support he needs", Richardson said.
"He has also been a great person to have around the club".
He said his brief stay at the Warriors - where he helped prepare the team for six wins and eight losses - had been of huge benefit. "I'm disappointed to see him go but we wish him all the best". "I'll be following the club with plenty of interest".
McNamara, who worked alongside Kidwell for the ANZAC Test in May, said: "I thank the New Zealand Rugby League for giving me the opportunity to work with the Kiwis and wish the team all the best for the Rugby League World Cup".
The Dragons lie ninth in the Super League table and have turned to former England boss McNamara following the recent axing of Laurent Frayssinous.
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