The Blues are reportedly unclear why Sonny Bill Williams covered up a sponsorship logo on his playing jersey during last night's Super Rugby match against the Highlanders and plan on taking the matter up with Williams' manager Khoder Nasser.

Williams had only been back on the field for a matter of minutes before creating a social media stir by covering up the BNZ logo on his Blues jersey's collar with medical tape.

Newstalk ZB's Tony Veitch has reported that the Blues were unaware of SBW's plans to make the changes and would adress it with his management this week.

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