Boyd Cordner in doubt but Sonny Bill Williams will play NRL grand final for Roosters BOYD Cordner has until Saturday to prove his fitness for the grand final but Sonny Bill Williams is a certain starter for Sydney Roosters. Dally M coach of the year Trent Robinson today declared a calf injury and last week's food poisoning scare would not stop champion backrower Williams from playing Sunday's NRL decider against Manly. Cordner, the Dally M second-rower of the year, is hoping to return after seven weeks sidelined by a broken ankle but Robinson was circumspect on his chances of playing. He said veteran Luke O'Donnell was also some chance of returning from a hamstring injury. Robinson said 21-year-old Cordner would get a say in his own fate. "Sonny Bill will be OK but he does have some bumps and bruises and he was crook last week," Robinson said at today's grand final lunch. Roosters forward Boyd Cordner has until Saturday to prove his fitness for the grand final against Manly. (Cordner) wants to play but is also aware that he doesn't want to let his team down. Just the enormity of the game puts a lot of pressure on these decisions. People think about these games for the rest of their lives, so playing a guy or not playing a guy is really important. But we're really comfortable with the selections we are going to make so it hasn't been an issue for us. Robinson said Cordner would need to be capable of playing the full 80 minutes and insisted the young star would do nothing to compromise his team. Everyone sees a 21-year-old but we don't see that. He's got some experience," Robinson said. He's a tough man but he's also a realist. He helped us make the call last week (to miss a preliminary final against Newcastle) and he's in the same frame of mind. He's not going to let the boys down by playing if he's not ready. Captain Anthony Minichiello said the NSW Origin forward was keeping a cool head in his bid to be fit. "He's doing everything he can to be fit for Sunday," Minichiello said. Sonny Bill Williams during the Sydney Roosters grand final team photograph at Allianz Stadium.