New Zealand Rugby have indicated they will require some form of clarification over Sonny Bill Williams' private sponsorship stance.

Williams put himself back in the news last weekend by taping over the BNZ logo on his Blues jersey in his Super Rugby comeback on Saturday night.

It's been seen as a religious stand by Williams, a Muslim, who was playing his first match in the 15-man game since the 2015 World Cup final, after recovering from a ruptured Achilles tendon suffered at the Rio Olympics sevens.

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