New Zealand Rugby boss Steve Tew says denying Charles Piutau a place at the Blues next year before he moves to Ulster is about "protecting the integrity" of the competition and avoiding creating a precedent, rather than a punishment.
With All Blacks outside back Piutau not appearing for the Belfast club until September, he would have been available for 11 of the Blues matches next season.
He and his struggling franchise approached the New Zealand Rugby on that basis, only to be denied. Piutau had been close to signing a contract extension with New Zealand Rugby, only to do an about-turn at the last minute and sign a two-year deal with Ulster.
Talking on Radio Sport in response to the story published in today's Herald, Tew said the case was relatively clear-cut.
"When players are coming back [to New Zealand] or departing, we have a policy framework we use which largely rewards players who have shown some loyalty and longevity to New Zealand rugby," he said. "There are some trigger points where you might make some exceptions, particularly if they're going to be available for the whole campaign. We've done that particularly for guys who are returning from Japan.