Meanwhile, since the season-ending win over Bay of Plenty, Caucau has returned to his homeland and was quoted in the Fiji Sun claiming to be "ready and fitter" as he chases down a contract in Japan.
Caucau also was quoted as saying his hand was up for selection into the national squad, although there were no guarantees that would happen.
Witcombe, who used to coach in Japan before coming back to Northland to be part of the Taniwha set-up, said the expectation on foreign players was high and Caucau would need to have his body in the right shape.
"If you're a contracted player, a foreign one, you're expected to work hard. The Japanese players work themselves into the ground, but, talent-wise we're brought up with rugby [and] it's in our culture. That's probably where the Japanese are maybe a little behind.
"As far as expectation going to Japan, you'd be expected to fit into their culture. I'd definitely do some medical research on him if I was a club in Japan [and] I'd be ringing up and finding out what sort of character he was."
However, with the ITM Cup season over, Witcombe's focus had now shifted to recruiting for next season and writing reports on this year's progress.
"It'd be easy to look at the results [and criticise] but I think we've made a lot of progress in the fact that 15 [players] played their first game for us," Witcombe commented, before adding that so far about 19 current players had been re-contracted.
"George [Konia] and I knew it was going to be tough [and] with the exception of two games we were within 10 points."