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Michael Cheika says he has no fears about throwing young forwards into the fray against a physical Argentina pack as he prepares to hand Lopeti Timani his run-on debut at Twickenham this Saturday.Timani is competing with the Bath-based Leroy Houston for the Wallabies No.8 spot and replaces the injured Sean McMahon, who is expected to miss a month with syndesmosis picked up in last weekends loss to South Africa in Pretoria. Houston may yet earn a Test debut via the bench, which has yet to be finalised.The towering Rory Arnold is also likely to be drafted in at lock, where he will partner fellow young gun Adam Coleman, at the expense of Rob Simmons in the only other change to the starting line-up from the 18-10 defeat.Simmons passed all concussion protocols after suffering a head knock against the Springboks but is expected to be axed as Cheika searches for the best combination.In opting for the relative inexperience of Timani (one Test) and Arnold (four Tests), Cheika said the Wallabies could have no fear in backing young stars.We cant be frightened to do that. No matter what game it is, whether its Argentina (or anyone else), he said.Timani, who came off the bench in the victory over Argentina in Perth last month in his only Test to date, would bring some much-needed size and aggressive running at Twickenham on Saturday, Cheika said.With the versatile Dean Mumm - a lineout specialist - making his home at No.6, Cheika believes the Wallabies need a hard-runner at the back of the scrum in the mould of veteran Wycliff Palu.I think with the profile of the other players we have, like the sixes who are more the jumping-type sixes, that ball-carrying, Wycliff Palu-style No.8 is something that we want to have as well, Cheika said.We want to be able to do both. Leroy is quite an abrasive runner as well, so theres a great opportunity to (see) how hell go with the step up.Arnold has impressed off the bench, and Cheika hopes he takes this weekend is a chance to prove he deserves to be a long-term starter.Hes just been aggressive, his lineout jumping has really improved, his mobility and ball carrying... and every time hes come onto the field from the bench hes made an impact as a finisher, Cheika said.I just think its a real opportunity for him.Likely Australia XV:?15. Israel Folau, 14. Dane Haylett-Petty, 13. Samu Kerevi, 12. Bernard Foley, 11. Reece Hodge, 10. Quade Cooper, 9. Will Genia, 8. Lopeti Timani, 7. Michael Hooper, 6. Dean Mumm, 5. Adam Coleman, 4. Rory Arnold, 3. Sekope Kepu, 2. Stephen Moore (capt), 1. Scott Sio.Cristian Roldan USA Jersey . 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Daniel Lovitz USA Jersey . -- If this was Aaron Gordons final home game at Arizona, and it almost certainly was, then he went out in style.OWINGS MILLS, Md. -- As the Baltimore Ravens grind through another training camp practice, Joe Flacco drops back gingerly to throw.The quarterback has a metal brace wrapped around his left knee and is the only player on the field in a red jersey. Hes wearing No. 5, but it might as well read: Do Not Touch.Flacco was once considered a Baltimore football equivalent to Orioles Hall of Famer Cal Ripken, baseballs Iron Man. Now, however, Flacco is seeking to return from a season-ending injury in November that snapped his run of 137 consecutive starts.It was one of many injuries that contributed heavily to a dismal 5-11 finish for the Ravens -- their first losing season under coach John Harbaugh.In his previous seven years, Harbaugh compiled a 72-40 record, reached the playoffs six times and won a Super Bowl.Then came 2015, when everything went awry.Baltimore placed 20 players on injured reserve, eight of them starters. The downward spiral began on the first day of training camp, when top draft pick Breshad Perriman tore a knee ligament. The speedy wide receiver was supposed to fill the void left by the departure of free agent Torrey Smith, but Perriman never played a minute and remains in recovery mode with the Sept. 11 opener against Buffalo less than a month away.Flacco and running back Justin Forsett (broken arm) are back on the practice field, but neither played in Baltimores preseason opener Thursday night.The wait remains for Perriman, wide receiver Steve Smith (torn Achilles tendon), and linebackers Terrell Suggs (torn Achilles tendon) and Elvis Dumervil (foot). All four are on the physically unable to perform list and have been rarely seen this summer, even on the sidelines.They all want to play, I know that, Harbaugh said this week. Theyre all working really hard to play in the preseason, but were certainly expecting them all back for the opener. Well just have to make some decisions. Terrell Suggs is the closest. He had the injury the soonest. Hes already on me about practice, and Im holding him back right now. Hell be out there soon practicing. How muchh we play him remains to be seen.dddddddddddd The other guys are probably a little longer away than he is -- him being ready -- but well just see where we go.Theres also the matter of tight end Dennis Pitta, who had his season end in 2013 and 2014 with a serious hip injury. Pitta missed all last year and is attempting another comeback, but his bid was stalled by a sprained finger he received during a training camp scuffle.If it isnt one thing, its another.Third-round draft pick Bronson Kaufusi, a promising defensive end, broke his ankle in a low-contact drill and will miss the entire season.Thats a part of the game; its a part of football, Harbaugh said with a shrug. It happens for a reason, in my opinion. You have to look at it that way.At least the Ravens have Flacco, who spent countless hours rehabilitating his knee to be ready for the start of training camp. Baltimore used three starting quarterbacks in his absence last year, none of whom came close to serving as an adequate alternative to the franchise leader in completions, touchdown throws and yards passing.Obviously, last season, what he went through -- what a lot of guys went through -- to have him back and leading this team says a lot about his character, his toughness and why hes one of the best, said safety Eric Weddle, arguably the most significant of Baltimores offseason free agent pickups.Until Smith and Perriman join the mix, its uncertain who Flacco will be targeting on the outside. Newcomer Mike Wallace appears to be the most viable option, but he knows he cant go it alone.I cant wait until they get back, because I just want to see our group in full, Wallace said. I think we can be dangerous.Being healthy would be good enough.I think you always want to play at full strength, Flacco said. But in the NFL, thats not a reality. You go out there, you play your best, and do your best with what youve got.---AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL ' ' '