RIO DE JANEIRO, Brazil -- The world players union on Friday accused World Cup organizer FIFA of failing to protect Uruguay midfielder Alvaro Pereira after he played on following a hard blow to the head that he said felt "like the lights went out. Hydro Flaske Med Sugerør ." Pereira lay motionless after colliding with Raheem Sterlings knee in the 61st minute of Uruguays 2-1 victory on Thursday. Even though he appeared like a punch-drunk boxer, Pereira ultimately was allowed to return in the 63rd minute. The union urged FIFA "to conduct a thorough investigation into its own competition concussion protocol which failed to protect Uruguayan footballer Alvaro Pereira." It asked for "urgent talks and immediate assurances that FIFA can guarantee the safety of the players." It also suggested possible rule changes so players suspected of being concussed can be temporarily substituted while theyre diagnosed. "Football is awash with incidents in which players suffer potentially concussive blows to the head and stay on the pitch. In Pereiras case, he demanded to play on, overruling advice from Uruguays team physician for him to be immediately substituted," FIFPro said in a statement. "FIFPro understands that in certain moments, faced by the pressures of such an important international stage, many players would react in this way. There are times, however, when the players also require greater protection against the prospect of making any rash decisions." As he slid for a ball just outside Uruguays penalty area, Pereiras temple inadvertently struck Sterlings left knee. "After the hit, I only recall that I was unconscious for an instant," he said. "It was like the lights went out a little bit." Teammates surrounding the motionless player signalled for a stretcher. Team medical staff came onto the field. Pereira wobbled to the sideline. Uruguay physician Dr. Alberto Pan signalled for a substitution. Pereira seemed to be having trouble maintaining his balance. He argued and angrily wagged a finger to signal he didnt want to be substituted. "I said sorry a thousand times to the doctor because I was dizzy. It was that moment your adrenaline flowing in your body, maybe without thinking ... what I really wanted to do was to help get the result," the 28-year-old Sao Paulo FC player recalled. "What really matters is that everything is OK. Nothing happened. It was just a scare". Pereira said a team doctor and a FIFA physician checked him after the match. There was no immediate confirmation on whether he sustained a concussion, a subject that is slowly moving up the agenda in the sport. FIFPro said it would monitor Pereiras health on Friday. "He must be subjected to further evaluation and follow-up procedures that help determine if and when he can return to training," it said. The union said it also is considering appointing its own independent doctors "for all future FIFA competitions." "The World Cup must set the standard for player health and safety to educate the international football community. Medical evidence shows that a person faces the risk of very serious brain injury, or worse, if he or she suffers a severe head trauma from a concussive blow," FIFPro said. "Furthermore, FIFPro states any sideline concussion assessment must not be conducted solely by a national team physician. In order to ensure real independence, FIFPros involvement, as the international authority representing the interests of the players, would ensure they are insulated at all times." In the English Premier League, Tottenham came under scrutiny in November for an incident involving goalkeeper Hugo Lloris. Currently with the France squad at the World Cup, Lloris was allowed to play on after he was briefly knocked unconscious during a game after colliding with Evertons Romelu Lukaku, despite medical advice he leave the match. Hydro Flask Billig .com) - Eric Fehr and Marcus Johansson each registered a pair of goals, as Washington spoiled the head coaching debut of Peter Horachek by picking up a 6-2 victory in Toronto on Wednesday. Hydro Flask Barn . Then again, he really was at his home away from home. "It was nice to sleep in my own bed last night," Shields said after pitching Kansas City past the San Diego Padres 8-0 Wednesday. http://www.danmarkhydroflask.com/hydro-flask-40-oz-flaske.html . The Toronto Maple Leafs forward and Nashville Predators goaltender highlighted Mondays waiver transactions, with Calgarys Chuck Kobasew and Edmontons Philip Larsen also being placed on waivers.ROME -- Roger Federers decision to return to tennis a week after the birth of his second set of twins has the full support of his wife Mirka. And dont expect his schedule to change much now that he has four kids. When the boys were born earlier than expected, Federer consulted with his wife and team about playing the Italian Open. "And they all said I should quickly come and play here. So I was like, OK, if you dont want me around Ill go away," Federer recounted Tuesday. "That was basically it. "Things went well, the boys are healthy. Mirkas good, too," the 17-time Grand Slam champion added. "So its a great time in our lives right now." The boys names are Leo and Lenny. "Boys names are hard. It was all last minute," Federer said. "Girls, I feel like theres so many nice names and theyre all cute but with boys its totally a different story. "I miss them a lot already and also the girls," the fourth-ranked Swiss player said. "Its a different type of week but Ill get through it and I hope I can still play some good tennis." The couples twin girls, Myla Rose and Charlene Riva, will turn 5 in July. "This time around, we kind of know how to handle kids on the road," the 32-year-old Federer said. Hydro Flask Outlet. "Im aware its going to be a lot of work but at the same time I know what Im getting into. So its something Im very much looking forward to. ... There will be a long time without any travelling after the tennis is over, so Im looking forward to the next couple of years now." Federer had a strong start to the clay-court season by reaching the final of the Monte Carlo Masters. The Italian Open is the last key warmup for the French Open, which starts in less than two weeks. "I expect a lot from myself but then after what happened I come here a bit more laid back, just enjoy it," Federer said. "Ive had such a good start to the season that I want to just keep momentum on my side. "I didnt want too big a break. And it doesnt matter whether I play five matches or one match here, as long as I stay with the pulse of things on tour. Of course I hope I can win my first-round match but at the moment I have totally different priorities." A three-time finalist in Rome, including last year, Federer opens Wednesday against 47th-ranked Jeremy Chardy of France. ' ' '