Sonny Bill Williams has impressed coach Gordon Tietjens during training with the New Zealand Sevens squad.

Sonny Bill Williams has been joined by three more rookies in the New Zealand sevens squad to prepare for the Wellington round of the World Series.

Coach Gordon Tietjens has had to use his selection skills again to help cover the injury problems that hit his squad over the first two rounds of the series before Christmas.

Following last weekend's national sevens championship in Rotorua he has brought in the Counties Manukau pair of Josh Van Lieshout and Sione Molia along with Hawke's Bay's Billy Ropiha.

Veteran Kurt Baker returns to the scene as a contracted squad member for 2016. Scott Curry, Declan O'Donnell, DJ Forbes, Sherwin Stowers were not available because of injury and Liam Messam was not available due to rugby commitments in Japan.

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The biggest rookie of all will be Williams who has been impressing in his first trainings with the squad in terms of fitness, performance and attitude.

Tietjens has hinted strongly that Williams will get involvement at the tournament in Wellington on January 30-31.

The team to play Wellington Sevens will be named on Monday and the squad to travel to Australia for the Sydney Sevens will be named on February 1.

New Zealand Sevens squad for Wellington: Kurt Baker (Taranaki), Dylan Collier (Waikato), Sam Dickson (Canterbury), Akira Ioane (Auckland), Rieko Ioane (Auckland), Gillies Kaka (Hawke's Bay), Antonio Kiri Kiri (Manawatu), Ben Lam (Auckland), Josh Van Lieshout (Counties Manukau), Tim Mikkelson (Waikato), Sione Molia (Counties Manukau), Lewis Ormond (Taranaki), Augustine Pulu (Counties Manukau), Billy Ropiha (Hawke's Bay), Ardie Savea (Wellington), Teddy Stanaway (Bay of Plenty), Isaac Te Aute (Bay of Plenty), Isaac Te Tamaki (Waikato), Beaudein Waaka (Taranaki), Regan Ware (Waikato), Sonny Bill Williams (Counties Manukau), Joe Webber (Waikato).