Sonny Bill Williams

Blues don't know why Williams taped up logo

The taped-up collar was obvious when the All Black centre came off the bench in the Blues game against the Highlanders in Dunedin on Saturday night.

It was understood Williams, who is Muslim, covered the logo for religious reasons.

Muslims believe the charging of interest is prohibited by the Quran.

As a part of their collective agreement any player can lodge a conscientious objection to promoting finance, alcohol, tobacco, gambling companies and banks.

Sonny Bill Williams nearing the end of his long injury rehabilitation

The All Blacks' star hasn't played since rupturing an Achilles tendon, during the New Zealand sevens team's Olympic Games campaign last year.

But his rehabilitation is moving at a promising rate and the 31-year-old expects to make his Super Rugby debut for the Blues in April.

"Slowly but surely. It's a tough old injury to come back from but I'm doing my part and I'm doing my best to hopefully get on that field soon," Williams said, during Thursday's RugbySmart launch at New Zealand Rugby headquarters in Wellington.

Sonny Bill Williams out of Olympics sevens

RNZ reports New Zealand suffered one of the biggest upsets in sevens history when they were beaten 14-12 by Japan.

In a double blow for the team Sonny Bill Williams has been ruled out of the tournament with a partial Achilles rupture. He has been replaced by Sione Molia.

Joe Webber also left the field with a suspected dislocated shoulder.

The New Zealanders struggled to get possession in the first half of the pool match against Japan - with the score 7-7 at half time - and Japan defended well after the break.