KANSAS CITY, Mo. -- Chiefs offensive tackle Donald Stephenson was suspended by the NFL for the first four games of the regular season Friday for violating the leagues performance-enhancing substance policy, a massive blow to an already unsteady offensive line. Stephenson remains eligible to participate in all preseason practices and games, including Saturday nights contest against Minnesota. He will miss games against Tennessee, Denver, Miami and New England and be eligible to return to the active roster Sept. 30. The substance was not disclosed. The Chiefs said in a three-sentence statement that they were informed of the positive test on Friday and expressed disappointment in losing Stephenson, but declined further comment. Stephenson said in a statement issued through the NFL Players Association that he took a medication that requires a therapeutic-use exemption and failed to properly investigate it. "The rules are strict, and without a TUE, the consequence is a four-game suspension," Stephenson said in the statement. "It is not a mistake I will ever make again. I will train extremely hard during my time away from the team and I will be ready to contribute to my teams effort to win a Super Bowl as soon as I return." Stephenson was a fill-in starter last season but was expected to anchor the right side this year, taking over for former No. 1 overall draft pick Eric Fisher as he moved back to left tackle. With perilously little depth, Stephensons lost could result in plenty of shuffling. Jeff Allen is expected to move from left guard to right tackle, filling in for Stephenson but creating a new hole. Ricky Henry and Jeff Linkenbach, who were fighting for a backup job, are now in a race to replace at Allen at starting left guard for the first four games of the season. "Were rotating people around and well keep doing that," Chiefs coach Andy Reid said. "When were satisfied with who the five best are well roll from there. I dont really care about positions right now. I just care about getting the five best out there." The Chiefs have tried several permutations through their first two preseason games, and none of them has engendered a great deal of confidence. If they havent been hit with false start and holding penalties, theyve struggled to open holes and contain the pass rush. "We dont make any excuses for them," offensive co-ordinator Doug Pederson said. "Guys just have to focus in on detail. They get in the heat of the battle and sometimes they get a little fatigued and into the game, but they still have to concentrate and understand how were snapping the ball, when were snapping the ball. We need to eliminate those types of penalties, the holding penalties and obviously the sacks and turnovers." The trickle-down of Stephensons suspension could also impact the number of offensive linemen the Chiefs keep when they go through roster cuts. Teams must trim from 90 players to 75 by Tuesday afternoon, and final cuts to the 53-man roster limit are due Sept. 30. The Chiefs were already without their top wide receiver, Dwayne Bowe, for the season opener after he was suspended by the league for an incident involving marijuana last November. Theyve also been dealing with a rash of injuries. Inside linebacker Joe Mays sustained a wrist injury that will require surgery and is likely to keep him out for the first few weeks of the regular season, and running back Jamaal Charles, safety Eric Berry and wide receiver Junior Hemingway have all been dealing with nagging injuries during training camp. Wholesale Air Jordan 1 . -- The Oakland Athletics and free agent right-hander Bartolo Colon have agreed to terms on a US$2 million, one-year contract, bolstering their depleted starting rotation. Air Jordan 1 From China . Mired in an offensive slump, Lowry - the NBAs leader in taking charges this season - did what he has learned to do best, standing his ground and drawing a crucial offensive foul on the Cavaliers all-star point guard. Fast forward 30 seconds to the Cavs next possession, with the home team still trailing by three, Spencer Hawes - one of the leagues best passing big men - threw an interception, intended for Tyler Zeller and picked off by DeMar DeRozan. http://www.airjordan1clearance.com/ . They were expecting him there all along. The Pacers announced Friday night that George has been cleared "to return to normal basketball activity," a decision made three days after he was concussed in Game 2 of the Indiana-Miami series. Sale Air Jordan 1 Shoes . Bjoerndalen, who had failed to win any major race for two years before Sochi, writes in a Facebook entry that he is "full of energy and inspiration" after winning the 10-kilometre sprint and mixed relay at last months Olympics. Air Jordan 1 Outlet Store . Braves reliever David Carpenter was also fined for throwing at Rockies outfielder Corey Dickerson in the same game, which featured several ejections, including Colorado manager Walt Weiss.ANNAPOLIS, Md. -- Navy football player Will McKamey, who has been hospitalized since collapsing at practice three days ago, has died while in a coma. He was 19. The academy says the freshman running back from Knoxville, Tenn., died at the University of Maryland Shock Trauma Center in Baltimore on Tuesday with his family by his side. "We are all so very heartbroken by the death of Midshipman Will McKamey," Naval Academy Superintendent VADM Mike Miller said in a statement. "This is devastating news for his family, his classmates, his teammates and the entire Naval Academy family. We offer our deepest condolences to Wills family, friends and shipmates in the wake of this tragedy." He collapsed during spring practice Saturday and was airlifted to the Shock Trauma Center. Earlier this week, McKameys family said in a statement released through the school that their son did not sustain "a bad hit or unusual or extreme contact" in that practice. "The Navy coaches have poured through the films of practice and seen nothing more than Will carrying the football normally, doing what he truly loves," the family said. McKameys father, Randy, a high schooll football coach at Grace Christian Academy in Knoxville, posted on Twitter that his son underwent surgery Saturday to relieve pressure on the brain.dddddddddddd Will McKamey played for his father and ran for more than 2,000 yards as a senior at Grace Christian in 2012. He suffered a head injury during a game late in the season that caused him to be hospitalized. His family said he had been cleared to resume playing football after seeing four neurosurgeons and undergoing several CAT scans and MRI exams. The 5-foot-9, 170-pound McKamey did not play in a game last season. He was an oceanography major in 3rd Company at the Naval Academy. "During this most difficult of times, first and foremost, our prayers and thoughts turn to Randy, Kara and their beautiful family," Navy coach Ken Niumatalolo said. "Our deepest and most sincere condolences go out to their entire family and friends. As our Navy football family mourns the loss of one of our brothers, we also celebrate and honour his life. He loved his family, his friends and his teammates. The Brotherhood loves you! Keep the ball high and tight in Heaven." Navy said funeral arrangements are pending. 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