Wests' Fijian flyer Marika Koroibete grounded by injury Marika Koroibete is in doubt for Thursday night's showdown with Manly in Gosford with a sprained foot Source: The Sunday Telegraph ROOKIE Wests Tigers speed machine Marika Koroibete is in doubt for Thursday night's showdown with Manly in Gosford with a sprained foot. With Lote Tuqiri and Matt Utai already in the Tigers' casualty ward, the injury opens the door for James Tedesco or Tagele Naiyaravoro to play against the Sea Eagles. Fijian flyer Koroibete suffered the injury during last Friday night's win over Parramatta at Leichhardt Oval. The Tigers speedster went for scans yesterday with the best-case scenario being he is fit and available for selection for the Sea Eagles clash. Koroibete has scored eight tries in nine NRL games and has instantly become a cult figure for the Tigers. The Fijian born-and-raised winger topped the Tigers running metres again last Friday, running for 134m, narrowly nudging out Tigers prop Aaron Woods on 133m. The Tigers in line to replace Koroibete if he is ruled out include young gun fullback Tedesco or NSW Cup winger Naiyaravoro. Utai was originally ruled out until round five but coach Mick Potter confirmed he may also be available. Dual international Tuqiri is expected to be sidelined for at least another three months. Meanwhile, Parramatta coach Ricky Stuart spent yesterday searching for a single positive from the Eels' heavy loss. Stuart slammed his side's lacklustre display at Leichhardt, especially in defence. "It's just ill-discipline and I'm not going to stand for that type of ill-discipline," he said. You don't turn your back on a penalty like that - mum could have run through there and scored, it's just bullshit. But Stuart stopped short of criticising Jarryd Hayne specifically after the on-field captain had a running battle with referees Shayne Hayne and Alan Shortall all night. "When the penalty count is 5-0 going into half-time I can understand why he gets frustrated," Stuart said. The same thing happened to us last week, there were a number of penalties that we were getting penalised for that out there tonight and last week the opposition were getting away with. And that disappoints me but it's not an excuse. I can understand the frustration, he's a new leader and he'll learn from that tonight. The Eels will have no excuses through scheduling with their round four clash with the Roosters on Easter Monday more than a week away.