Warriors managing director Jim Doyle said while it was disappointing to lose a coach of McNamara's calibre mid-season the club wouldnt stand in his way.
Former England head coach Steve McNamara is set to return to Super League after being released from his contract with New Zealand Warriors.
"I am honoured to be appointed as the head coach of the Catalans Dragons", he told the club's official website.
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.
Catalan Dragons have confirmed the appointment of Steve McNamara as the club's new head coach.
He was also an assistant coach for the Kiwis national team. "I can't thank the Warriors enough for their understanding and enabling me to take up this job as soon as possible".
McMamara's first game in charge will be Saturday's trip to Warrington.
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McNamara, a former Hull, Bradford, Wakefield and Huddersfield forward, began his coaching career with the Bulls Academy before taking over their first team in 2006.
Kiwis Rugby League World Cup campaign manager Shane Richardson said they were not far off announcing another assistant coach.
He then moved to Sydney when the Rugby Football League position reverted to being part-time and helped steer England to a series win over the Kiwis in the autumn of 2015.
NZRL would like to thank Steve for his contribution, and realises that a head coaching role and an opportunity to be closer to his family who are based in the United Kingdom is too good an opportunity to turn down.
Catalans chairman Bernard Guasch said: "The signing of Steve McNamara is great news for our club".
"I'm highly supportive and hope he does well whatever he does".