ALAMEDA, Calif. - The Oakland Raiders placed starting middle linebacker Nick Roach on season-ending injured reserve Wednesday after he was unable to recover from a concussion in the preseason.Roach originally got hurt Aug. 22 in the third exhibition game against Green Bay. He returned to practice Sept. 3 on a limited basis but only took part in individual drills and he was never able to be cleared for contact. Now he is done for the season.Its certainly a blow, no question about it, interim coach Tony Sparano said. Nick was one of our defensive leaders. Hes a guy that we rely an awful lot on. Its one of the body blows that goes on in our business.Roach was supposed to be the quarterback of the defence and his absence has played a big role in Oaklands early struggles. After playing every defensive snap in his first year in Oakland in 2013, Roach has been unable to make it on the field this year.After consulting with doctors, Sparano said the team had no indication of when Roach would be cleared to play, leading to the decision to shut him down.It was certainly going to take a little while longer and it was open ended at the end of it, Sparano said.The Raiders (0-4) have been plagued by miscommunication and alignment issues on defence without their signal caller. Oakland has the second-worst run defence in the NFL through four games with Miles Burris and Kaluka Maiava sharing the duty at middle linebacker.Roach is Oaklands second linebacker to be shut down for the season this week. Maiava was placed on injured reserve Tuesday with a hamstring injury, leaving Burris as the starting middle linebacker on Sunday against San Diego.I bounce things off Nick all the time and I still will, Burris said. Hes still going to be around. Hell still be just as big a part of this team because hell be helping everybody out. Nick sees football. He has a great football mind. He sees things that a lot of people cant see on the field so that will be big.The Raiders got some positive news at the position with outside linebacker Sio Moore back at practice Wednesday after missing the past two games with an ankle injury.Moore was limited at practice but his return will provide a boost to the defence.When youre not out there fighting every day, you feel sick to your stomach, Moore said. I just wanted to be out there doing my part to help, doing everything I can.The Raiders signed Jamar Chaney on Wednesday to replace Roach on the roster. Chaney is in his fifth season in the NFL and was cut in training camp this summer by Denver. He started 23 games from 2010-12 in Philadelphia, including all 16 in 2011, and played one game last season with Atlanta.Chaney has 161 career tackles with one sack, three interceptions, 12 passes defenced and one forced fumble.The Raiders had claimed linebacker Ray-Ray Armstrong off waivers from St. Louis on Tuesday. Armstrong joined St. Louis as an undrafted free agent out of Miami in 2013 and played all 16 games as a rookie. Armstrong has played four games this season and has been almost exclusively used on special teams.NOTES: QB Derek Carr was limited at practice after hurting his left knee and ankle before the bye but is confident he will be able to play Sunday. ... RT Khalif Barnes (quadriceps) did not practice and Menelik Watson may need to start in his place Sunday.___Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP_NFLFake Yeezys 2019 . The eighth-year point guard played in his 500th career game on Sunday, a 98-93 win over the Orlando Magic. 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These are your prime earning years. Dont mess it up. For the life of me I cant comprehend how guys dont realize that there is no other walk of life that theyre going to make the kind of money they make and have the fun they do being a pro athlete. Once its gone, its very difficult to recapture what you blew. Sure, maybe he has other off-court interests; youve got a long life to enjoy those. Capitalize on what youre doing now and dont be silly. Its a shame: talented guy who needs to get with the program. 2. AL HORFORD (Hawks): Significant blow to Atlantas season losing one of my favorites in the league. He was having another steady season at 18+ ppg and 8+ rpg. Thats hard to replace. Thank goodness they signed Paul Milsap (17 and 8 per game) as a free agent this past summer. Theyre going to have to ride him a bunch in the post area; hes more than capable. The nightly loss of Horford will be a big hole to fill though considering the lost Josh Smiths athleticism and scoring ability this past off-season. The Hawks are still a capable team that will be in the playoff hunt. It will just get harder to maintain that third spot in the East Standings. 3. TORONTO RAPTORS: Im afraid to snap my fingers right now for fear theyll come out of the zone theyre in at this stage. Theyve been really fun to watch and the energy, effort, and commitment to team has been top-notch. Ive got my fingers crossed it continues; its been an enjoyable stretch of hoops to say the least. The Raptors have a really difficult stretch of games coming up however, take a good look at the schedule. The travel will be frequent and the rest/prep time will be minimal. The true test for this group will be whether they can handle some of the adversity thats ahead. If they play the way theyre playing right now, they can hang with anyone. Theres still pllenty of time for GM Masai Ujiri to evaluate his team and make decisions in a calculated, big-picture way to determine whether he wants to buy, hold or sell.dddddddddddd You need to see guys get put through the ringer a good bit to see what youve got and just as important you need to evaluate what each team in your conference has and doesnt have to determine how you want to build your eventual contending team. 4. PORTLAND/MIAMI: Not sure if you caught the Heat/Blazers game on Saturday night or even caught the highlights but wow! The energy in the arena in Portland, one of the three best playing atmospheres in the NBA (OKC and Golden State are the other two), was off the charts. The action on the court was equally good. Sometimes when youre around pro sports you can get a bit cynical once in a while. When you see the level of passion and love for the sport and competition that both teams had it gives you goose bumps. The great teams and great players have incredible pride and a wonderful makeup. Thanks to the players on both teams for giving folks their moneys worth. 5. INJURIES: Last week we had Russell Westbrook and Al Horford added to the long list of elite players with significant injuries this year. There are a lot of theories as to why its happening. Ill just say this: Im firmly convinced that players are overtraining and not allowing their bodies enough rest/recovery time. In addition, many players hire their own workout guys in the off-season with their own theories/approaches that tend to differ from what they hear from their teams. I dont like that pattern. Im a huge believer in perfect practice makes perfect. When you train improperly or utilize varying training methods at different times youre exposing yourself to greater harm. In season, teams need to be more conscious of reducing the amount of time players spend on their feet. Its all about quality vs. quantity. Am I a bit concerned? Yes. Balance and moderation have got to be looked at more rather than obsessive overkill. Dont mistake activity for achievement! ' ' '