Auckland - Injury-plagued Blues lock Ali Williams faces another month on the sidelines after sustaining a hamstring injury during his team's 22-22 draw with the Western Force in their Vodacom Super Rugby match at Perth on Saturday.

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Williams was into the fourth game on his Super Rugby comeback after an Achilles tendon injury kept him out of rugby for most of the past two seasons and stalled his burgeoning All Blacks career.

"He's done a hamstring and at this stage it is looking like four weeks out," Blues coach Pat Lam told the New Zealand Herald newspaper, which reported that Williams was frustrated but philosophical about the setback in a Rugby World Cup year.

The injury will probably leave Anthony Boric and Kurtis Haiu as the starting locks to play Hurricanes at Eden Park in Auckland on Saturday.