Lote Tuqiri could move to fullback for Wests Tigers after they lost halfback Robert Lui to injury for up to six weeks on Monday.

Lui will be sidelined for 4-6 weeks with the ankle injury he picked up during Sunday's 44-32 NRL loss to the Sydney Roosters at the Sydney Football Stadium.

His most likely replacement in the No.7 jersey is current fullback Tim Moltzen.

Coach Tim Sheens has flagged Tuqiri playing at fullback sometime in his return season, but the dual international has started his first two games back in the NRL on the left wing, collecting a try in each.

The Tigers' coach had wanted to allow the 30-year-old, who spent seven years playing rugby union, to find his feet back in the 13-man game in the wing position where he previously played for the Brisbane Broncos.

Sheens faces a major selection decision before naming his side on Tuesday to play Parramatta this weekend.

His other main option for the halves is Arana Taumata, who has had little football because of an ankle injury and hasn't played a NRL match since 2008.

Former Cronulla back Mitch Brown could also be an option to play fullback.

Scans have revealed Lui has a ligament injury in his right ankle.

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