Prime Minister BIll English has weighed in on Sonny Bill Williams' decision to cover up a bank sponsor's logo during a game, saying it's hard to understand why one player would act differently to the rest.

Williams put himself back in the news 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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