All Black Sonny Bill Williams

Williams is still recovering from surgery on his achilles that he snapped during his campaign with the New Zealand Sevens team at the Rio Olympics.

The 31-year-old was training with the squad today and wants to be back playing by week six of the competition but his coach is keeping his cards close to his chest.

"I think our medical staffs are really mindful of loading too much on him too early.

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.