Kirwan met with Marshall’s manager Martin Tauber at his home in Sydney this week and the pair held talks about a move to Rugby.
Marshall is apparently contracted to the Wests Tigers until 2015 but a clause allows him to renegotiate after increases in the salary cap.
Tauber has made it clear that Marshall is fiercely loyal to the rugby league club that he made his debut for in 2003 so the only move would to rugby union as he would not play for another league club.
Marshall was stripped of the Kiwi captaincy and was benched at the Tigers this year and it is thought that he is not too happy in rugby league.
The New Zealanders has previously been linked to a team in Japan and the Waratahs but these were put down to attempts at increasing his contract value.