"I've enjoyed my time down here. In saying that, I'm not getting any younger and I need to start looking at the future.
"Whether that's committing to New Zealand rugby ... that's probably the first decision I have to make. Once I've made that decision, then I can decide what franchise I play for."
Thomson, 30, said he had no firm offers, as such, but was "talking to people".
He has been the Highlanders' best player for years and has played all his provincial rugby for Otago and all his senior club rugby for Otago University. Losing him will be a blow for all those organisations.
"I've enjoyed my time down here but there are other options now," Thomson said.
"There's a lot to say for a player who can play his whole career for one franchise or one province. I've got a lot of respect for guys that have done that.
"But also, when you get to my age and have played for this long, maybe a different environment can spur you on a bit."
Thomson enjoyed playing for Otago on Saturday but conceded he was disappointed not to be helping the All Blacks beat the Wallabies at Eden Park.
His international career seems to have hit a speed bump. Liam Messam has returned to the fold and Victor Vito adds extra physicality, so Thomson's unique blend of pace and talent on the blindside flank has been sidelined in the opening rounds of the Rugby Championship.
"I'm a bit disappointed. But in saying that, I came out of the Super rugby season pretty knackered. I've freshened up and put a bit of weight back on.
"Hopefully I can play one more game for Otago and come back into contention for the next test."
Thomson was impressed with the pace of his Otago teammates, most of whom he barely knows, and their willingness to play at a high tempo.
- Otago Daily Times
