Injured Wests Tigers halfback Robert Lui will need to complete a full week of training before coach Tim Sheens considers him for next Sunday's NRL clash with the Sydney Roosters.

The 20-year-old rising star suffered ankle ligament damage in round two, three weeks before Tim Moltzen's season was ended by a knee injury when the classy fullback was moved to No.7 as Lui's replacement.

"He's tipped for next week but with the bye the week after I'm not sure whether he'll be ready," Sheens said of Lui.

"He's got to have a full week's training, so if he runs a full week he'll be considered, but he's missed a bit of footy too so we'll wait and see what happens."

Lui's return would be a welcome sight for Sheens, whose injury-hit side made it back-to-back losses in Saturday's 26-18 defeat at the hands of Penrith.

The Tigers are now in danger of blowing a promising start to the season, slumping to four from seven ahead of the Campbelltown Stadium clash with the Roosters, who put 44 points past them in round two.

Youngster Blake Lazarus has worn the No.7 jersey for the past two weeks, although he spent much of the CUA Stadium clash at fullback with Daniel Fitzhenry moving into the halves.

"It was a bit of a hole losing Tim Moltzen and it's been tough on young Blake too when his forwards don't lay a platform," Sheens said.

"If you don't lay a platform and you turn the ball over and all you're doing is defending, it's pretty hard for the kid.

"That happened last week and happened particularly in the second half (against Penrith)."

The Tigers completed just nine of 18 sets in the second 40 minutes against the high-flying Panthers and captain Robbie Farah said his side were putting two much pressure on themselves with plays like Benji Marshall's flick pass gone wrong to Lote Tuqiri on their own 20m line.

"We're making simple mistakes that you expect from a park football team, silly offloads, not getting up to play the ball properly, forcing the pass," Farah said.

"At the moment we're rolling the sleeves up and working hard in D (defence) but in attack I think we're looking for the easy option instead of getting in the grind and playing five tackle, kick-chase, waiting for them to make the mistake.

"You're not going to win footy games when you do that, especially in an away game.

"Not only mistakes but discipline as well, too many penalties piggy-backing them down into our end."

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