Taupau's player agent Darryl Mather, described news of Nestruck's revelation as "extraordinarily frustrating", but he was leaving further comment to the two clubs.
"I'll allow both the Wests Tigers and Martin Taupau to make any official comment they might want to make on this matter," Mather told AAP.
"I'll be guided by Phil Moss (Tigers football manager) and the Wests Tigers on the matter."
Both clubs declined to comment, saying they were looking ino the matter.
Taupau had been linked to the Sea Eagles, with Manly looking to add another forward to their rebuilt pack alongside Nate Myles, Lewis Brown, Darcy Lussick and Matt Parcell who they have already signed for next season.
The Tigers are also known to be attempting to fix their dire salary cap situation, following on from the attempted release of Robbie Farah in August.
The 25-year-old Taupau is in the UK touring with the Kiwis who face England in Hull on Sunday.
- AAP