Wests Tigers half-back Robert Lui is facing between four to six weeks on the sideline with an ankle injury.<br><br>Lui rolled his right ankle early in the first half against the Sydney Roosters at the Sydney Football Stadium yesterday in round two of the Telstra Premiership.<br><br>Scans today undertaken by Wests Tigers Club doctor Donald Kuah revealed an ankle ligament injury.<br><br>Wests Tigers Coach Tim Sheens will tomorrow name his team to play Parramatta Eels in the round three blockbuster at the Sydney Football Stadium this Friday night.