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PITTSFORD, N.Y. -- Quarterback Kevin Kolbs chances of earning the Buffalo Bills starting job were nearly upended by a wet and slippery rubber mat. Kolb, who is locked in a competition with rookie first-round pick EJ Manuel, avoided serious injury to his left knee when he slipped and stumbled awkwardly while switching fields between practice drills Saturday. Coach Doug Marrone said the injury does not appear to be serious. He called it "a bump," and listed Kolb "day by day." Marrone also provided an update on the status of Stevie Johnson, saying the teams No. 1 receiver will miss at least a week with a pulled left hamstring. Johnson was hurt in practice Friday. Kolb wasnt available for comment, but showed frustration by angrily tossing his helmet to the ground before being examined by head trainer Bud Carpenter. After a few minutes, Kolb got up got up on his own and was escorted to the locker room. Kolb was joining the quarterbacks and receivers in making their way through a tunnel to work out on an adjoining field. He slipped on a mat laid down over the concrete, and immediately began hobbling in pain. Kolb then put his arm around Carpenters shoulder for support. It was a freak accident that happened about 50 minutes into practice at Bills training camp in suburban Rochester. When wet, the mats provide very little traction, especially for players wearing cleats. Shortly after Kolb slipped, several camp volunteers arrived with brooms to sweep away any remaining water from the mats. Manuel took the extra precaution the next time he went through the tunnel by walking mostly on the concrete. This is but the latest in a series of setbacks for Kolb, who is entering his seventh NFL season and seeking a fresh start in Buffalo after signing a two-year contract in April. Selected by Philadelphia in the second round of the 2007 draft, Kolb was sidelined by a concussion in losing the Eagles starting job to Michael Vick to open the 2009 season. Kolb then spent the past two seasons in Arizona, where he failed to secure the starting job because of an assortment of injuries. Marrone said its unfair to label Kolb injury-prone. "The one thing I do know about Kevin is that he is a tough son of a gun," Marrone said. "Hell get back out there quickly if its up to him." In the meantime, Manuel will be getting more practice time with the starters. Thats a significant step up after Kolb spent much of the first week of camp getting most of the work with the starters. Marrone had been increasing Manuels responsibilities over the past week, with the two quarterbacks nearly evenly splitting snaps by Friday. Marrone liked how Manuel responded after Kolb was hurt by not letting the injury affect him or the offence. "It was a very smooth transition," Marrone said. "It can affect the team. And I didnt see it affect the two guys behind him, so thats positive." Its too early to determine whether Kolbs injury will affect the quarterback rotation for the Bills preseason opener at Indianapolis on Aug. 11. Manuel has shown improvement with each day of practice. On Saturday, he hit Marcus Easley on a deep route, and also showed off his speed in taking off on quarterback sweeps. Manuel was selected 16th overall out of Florida State, and the only quarterback taken in the first round of the draft. The Bills have only one other quarterback at camp, Jeff Tuel, an undrafted rookie free agent out of Washington State. As for Stevie Johnson, the receiver was disappointed to be sidelined once again by injury. He missed most of the teams spring practices with a sore back. Hes also had a history of groin problems that have cropped up during camp. Johnson said he felt something pop just as he was pushing off his left leg to make a cut. He expects to be ready for the start of the season. "The seasons where the moneys made, man," Johnson said. "Ill be out there to play." NOTES: With WR Kevin Elliott (right shoulder) also out, the Bills signed undrafted rookie WR Terrell Sinkfield on Saturday. The Northern Iowa product has already been cut twice this off-season, by Miami and Green Bay. ... Reserve TE Mike Caussin, who hurt his hip Friday, will have the injury evaluated next week to determine how much time hell miss, Marrone said. ... DE Mario Williams took part in on-field individual drills for the first time since complaining of a sore foot before the first training camp practice.Gary Harris Nuggets Jersey . -- The boos poured down on Tom Brady and the New England Patriots at the end of a horrible first half. Thomas Welsh Jersey . A forerunning sled crashed into the worker Thursday at the Sanki Sliding Center. The unidentified worker broke both legs and was airlifted to a nearby hospital. http://www.nuggetsproshop.com/Carmelo-Anthony-Nuggets-Jersey/ . 10 VCU 85-67 on Thursday night at the Puerto Rico Tip-Off. The Seminoles (4-0) have scored at least 80 points in each of their games. Will Barton Nuggets Jersey . -- Chicago Bears cornerback Tim Jennings was selected Monday to his second straight Pro Bowl, while guard Kyle Long made it after a solid rookie season. Dikembe Mutombo Jersey . -- Chicago Bears cornerback Tim Jennings was selected Monday to his second straight Pro Bowl, while guard Kyle Long made it after a solid rookie season.SYDNEY -- The manager of Australias Olympics team says Rio de Janiero organizers havent answered her concerns about security in the leadup to next months games.Chef de mission Kitty Chiller wrote to games organizers on June 20 to express her concerns about pre-games security after Australian paralympics competitor Liesl Tesch and team physiotherapist Sarah Ross were robbed at gunpoint while training in Rio.Chiller asked organizers to bring forward the deploymennt of 85,000 security personnel to ensure team members are safe ahead of the August 5 opening of the games.ddddddddddddShe said Tuesday that she was confident the competition venues and surrounding areas will be safe during the game but Im going next week and I would like to know that I can walk the streets being safe from next week. ' ' '