Polota-Nau, who is recovering from an arm injury that sidelined him from the Wallabies’ Spring Tour, admitted he needed a “sea change” after 141 caps for the Waratahs.
It is understood Polota-Nau turned down advances from Japan and English club Bristol before signing with the Force from 2017.
“There were a few issues but more so it came down to the opportunity of playing for the Wallabies again,” said Polota-Nau, who has played 68 Tests since making his international debut in 2005.
“It’s really important that we make the most of our time in the gold jersey because it’s something to be proud of. Having worn it for the first time you never want to let it go.
“There’s that but I obviously need to have a sea change. I’ve loved my tenure at the Tahs, it’s been great. But I think it’s a great opportunity for the young up-and-coming hookers to show their wares as well.”