Wallabies hooker Tatafu Polota-Nau has been playing through as good as a broken arm, coach Michael Cheika says, and wont play another Test until its fully healed.Polota-Nau was the surprise high-profile casualty from Cheikas 30-man squad on Thursday for the Rugby Championship clashes against South Africa and Argentina.The 31-year-old fractured his right arm for the second time while playing for the NSW Waratahs in March.Despite playing through significant pain in the June Test window and the early part of the Rugby Championship, hes still not 100 per cent, and after discussing the situation with Polota-Nau, Cheika said the best course of action was for him to stop.Hes as good as playing with a broken arm. His arm hasnt mended properly, Cheika told reporters on Thursday.Hes got the plate in there and hes been really pushing hard and its a real credit to him because its been tough for him.But thats enough now.Polota-Naus a player that we want. What hes adding in games has been really vital for us and hes a player we want in top condition going forward.His decision to either have a rest or operate or whatever it might be, well make in the next couple of weeks and decide then what happens for him for the rest of the season.Polota-Naus understudy at the Waratahs, Tolu Latu, has joined the squad as his replacement and is one of two uncapped players, along with winger Sefa Naivalu, in line to become Australias 10th Test debutant this year.Cheika said he would do everything he could to ensure Polota-Nau returned to Super Rugby as soon as possible, amid reports hes agreed to a big-money deal with English Premiership club Bristol.Veteran winger Drew Mitchell, lock Will Skelton and back-rower Ben McCalman have been left out of the side due to a lack of recent match fitness.Mitchell will return to his French club Toulon, leaving Will Genia as the last remaining European-based Wallaby.The Fiji-born Naivalu finally became eligible to represent Australia on Monday and Cheika said he was excited to see what he could offer the team.Weve been going through a bit of a changeover in a few positions and the idea is that were going to build more depth, he said.Young prop Allan Alaalatoa is also in the mix after overcoming the medial ligament strain he suffered in Brisbane, although Cheika admitted it was touch and go whether he would be right to take on the Springboks in Pretoria on October 1.The Wallabies face Argentina at Londons Twickenham Stadium a week later.Wallabies: Allan Alaalatoa, Rory Arnold, Adam Coleman, Quade Cooper, Kane Douglas, Scott Fardy, Israel Folau, Bernard Foley, Nick Frisby, Will Genia, James Hanson, Dane Haylett-Petty, Reece Hodge, Michael Hooper, Sekope Kepu, Samu Kerevi, Tevita Kuridrani, Tolu Latu, Sean McMahon, Stephen Moore (c), Luke Morahan, Dean Mumm, Sefania Naivalu, Nick Phipps, Tom Robertson, Rob Simmons, Scott Sio, James Slipper, Henry Speight, Lopeti Timani.John Lackey Jersey . - Oakland Raiders running back Rashad Jennings was speaking to a group of local high school students earlier this week when the conversation turned to the importance of being prepared when opportunities in life arise. 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The Dane followed up his first European Tour title last weekend with eight birdies and just a single dropped shot on Thursday for a one-stroke advantage over South Africas Allan Versfeld and Portugals Ricardo Santos.The undefeated Baltimore Ravens face their biggest test so far Week 4 against the Oakland Raiders and their high-powered offense.Baltimore, however, already got a significant boost to its lineup heading into the game.Linebacker Elvis Dumervil returned to practice and is expected to make his season debut Sunday. The Ravens will need the extra help to contain Raiders quarterback Derek Carr, who torched their secondary for a career-high 351 yards and three touchdowns in their matchup last season. Oakland (2-1) has already won twice on the road.He had a breakout game against us, probably in some ways, last year, Ravens coach John Harbaugh said about Carr. They still have built the offense for him in the same way they built it last year. Theyre going to get the ball off quick. Theyre going to protect him. Theyre going to keep him clean. He hasnt been sacked very much and hasnt had a lot of turnovers -- very few fumbles that hes caused. Thats a formula for success on offense. Theyve done a good job of that, and were going to have to figure out how to counter that.The Ravens are 3-0 for the third time in franchise history (2006 and 2009). Those wins have come by a combined 13 points and against teams that are now a cumulative 1-8. Baltimore has managed just four touchdowns over that stretch.Im not really too worried about it, Ravens quarterback Joe Flacco said. I feel like we know what is going on. We feel good about a lot of the things we are doing. We feel like we are ready to burst onto the scene. We have a lot of moving parts, a lot of guys catching passes. I think if we get our run game going a little bit and clean up the little things like penalties, some drrops and a couple missed throws -- stuff like that -- I think we will be going.ddddddddddddWhile the offense has struggled, the Ravens defense has come up big each game. Baltimore is allowing just 254.3 yards per game, second only to Seattle (250.3). The is a big improvement from last season when the Ravens failed to make key stops in the fourth quarter.Its a good group, well coached (with) a lot of talent on the defense, Raiders coach Jack Del Rio said in a conference call with reporters. They mix their coverages. Theyre physical up front. Its a very good football team.Oakland, meanwhile, has the second-best offense in the NFL, averaging 436 yards and 26.7 points per game. Carr has thrown for 867 yards with five touchdowns and one interception. In last seasons matchup, Carr threw the game-winning score to Seth Roberts with 26 second left.The game also marks a homecoming for former Ravens offensive lineman Kelechi Osemele, who signed with Oakland in the offseason for a five-year, $58.5 million deal. Osemele is looking forward to matching up with his former teammates.Its going to be great, Osemele said. I got to practice against these guys for so long and played against these guys for so long that its going to be exciting playing them on Sunday. Theres a few guys, obviously, that its going to be fun to finish through and play against them in a game. You couldnt really finish through and pancake your own teammates (in practice). Just to go out there and talk a little trash and get to compete against those guys is going to be fun. ' ' '