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." 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. 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The Canadiens added to their defensive depth this week by acquiring veteran Mike Weaver from the Florida Panthers.Philadelphia, PA (Sports Network) - The following is a list of inactive players for todays games. WASHINGTON REDSKINS AT NEW YORK GIANTS, 1:00 PM (ET) Washington - QB Kirk Cousins, WR Leonard Hankerson, DE Jason Hatcher, RB Roy Helu Jr., G Josh LeRibeus, S Brandon Meriweather, LB Keenan Robinson NY Giants - OT James Brewer, LB James Davidson, G Eric Herman, CB Jayron Hosley, RB Chris Ogbonnaya, LB Jacquian Williams JACKSONVILLE JAGUARS AT BALTIMORE RAVENS, 1:00 PM (ET) Jacksonville - DE Andre Branch, LB A.J. Edds, LB Khairi Fortt, CB Jeremy Harris, RB Denard Robinson, OG Tyler Shatley, CB Teddy Williams Baltimore - LB Arthur Brown, WR Michael Campanaro, CB Antoine Cason, NT Terrence Cody, G/C Gino Gradkowski, RB Lorenzo Taliaferro, DE DeAngelo Tyson CINCINNATI BENGALS AT CLEVELAND BROWNS, 1:00 PM (ET) Cincinnati - TE Jermaine Gresham, OT Tanner Hawkinson, DE Margus Hunt, QB A.J. McCarron, CB Terence Newman, WR Dane Sanzenbacher, WR James Wright Cleveland - TE Gary Barnidge, LB Karlos Dansby, DB Tashaun Gipson, DB Robert Nelson, OT Vinston Painter, DB KWaun Williams, RB Glenn Winston GREEN BAY PACKERS AT BUFFALO BILLS, 1:00 PM (ET) Green Bay - LB Carl Bradford, DT Bruce Gaston, C Garth Gerhart, CB Davon House, WR Jeff Janis, TE Justin Perillo, QB Scott Tolzien Buffalo - TE Chris Gragg, LB Randell Johnson, OT Cyrus Kouandjio, S DaNorris Searcy, FB Frank Summers, WR Deonte Thompson, DE Jarius Wynn HOUSTON TEXANS AT INDIANAPOLIS COLTS, 1:00 PM (ET) Houston - DB Josh Aubrey, TE Garrett Graham, DB Andre Hal, WR Andre Johnson, QB Thad Lewis, LB Whitney Mercilus, OG Xavier Sua-Filo Indianapolis - CB Jalil Brown, DT Montori Hughes, OT Andrew McDonald, LB Henoc Muamba, G Joe Reitz, C A.Q. Shipley, G Hugh Thornton MIAMI DOLPHINS AT NEW ENGLAND PATRIOTS, 1:00 PM (ET) Miami - LB Jonathan Freeny, G Nate Garner, RB LaMichael James, LB Jelani Jenkins, LB Chris McCain, LB Koa Misi, OT Billy Turner New England - CB Alfonzo Dennard, OT Jordan Devey, DL Dominique Easley, OT Cameron Fleming, DL Zach Moore, RB James White, LB Chris White PITTSBURGH STEELERS AT ATLANTA FALCONS, 1:00 PM (ET) Pittsburgh - WR/RB Dri Archer, WR Justin Brown, DE Clifton Geathers, OT Marcus Gilbert, LB James Harrison, QB Landry Jones, CB Ike Taylor Atlanta - CB Robert Alford, LB James Anderson, WR Julio Jones, S William Moore, QB Sean Renfree, OT Jonathan Scott, LB Tyler Starr TAMPA BAY BUCCANEERS AT CAROLINA PANTHERS, 1:00 PM (ET) Tampa Bay - OT Anthony Collins, LB Mason Foster, WR Robert Herron, DT Clinton McDonald, WR Solomon Patton, TE Austin Seferian-Jenkins, S Major Wright Carolina - CB James Dockery, OT David Foucault, S Robert Lester, QB Cam Newton, DT Micanor Regis, G Amini Silatolu, RB DeAngelo Williams OAKLAND RAIDERS AT KANSAS CITY CHIEFS, 1:00 PM (ET) Oakland - OL Tony Bergstrom, TE Brian Leonhardt, DT Stacy McGee, QB Matt McGloin, WR Denarius Moore, LB Sio Moore, OT Menelik Watson Kansas City - WR Donnie Avery, DE Allen Bailey, OT Laurent Duvernay-Tardif, CB Phillip Gaines, TE Richard Gordon, OL Eric Kush, QB Aaron Murray DENVER BRONCOS AT SAN DIEGO CHARGERS, 4:05 PM (ET) Denver - T Paul Cornick, RB Ronnie Hillman, WR Cody Latimer, OT Michael Schofield, TE Jacob Tamme, DT Mitch Unrein, CB Kayvon Webster San Diego - DT Ryan Carrethers, TE Ladarius Green, WR Dontrelle Inman, DE Cordarro Law, DT Ricardo Mathews, P Mike Scifres, DE Damion Square NEW YORK JETS AT TENNESSEE TITANS, 4:05 PM (ET) NY Jets - S Antonio Allen, G Dakota Dozier, OL Wesley Johnson, WR Walter Powell, QB Matt Simms, CB Josh Thomas, DL Muhammad Wilkerson Tennessee - OT Taylor Lewan, DT Mike Martin, QB Zach Mettenberger, SS Daimion Stafford, OT Byron Stingily, LB Kamerion Wimbley, WR Kendall Wright SAN FRANCISCO 49ERS AT SEATTLE SEAHAWKS, 4:25 PM (ET) San Francisco - CB Tramaine Brock, CB Chris Culliver, OT Anthony Davis, QB Josh Johnson, WR Stevie Johnson, C Marcus Martin, S Bubba Ventrone Seattle - TE Rashaun Allen, CB Marcus Burley, DE Demarcus Dobbs, TE Cooper Helfet, WR Kevin Norwood, DT Travian Robertson, C Max Unger MINNESOTA VIKINGS AT DETROIT LIONS, 4:25 PM (ET) Minnesota - LB Anthony Barr, S Robert Blanton, OT Carter Bykowski, DT Sharrif Floyd, FB Zach Line, OT Phil Loadholt, G David Yankey Detroit - G Rodney Austin, WR Ryan Broyles, DT Nick Fairley, QB Kellen Moore, DT Caraun Reid, G Garrett Reynolds, DE Larry Webster DALLAS COWBOYS AT PHILADELPHIA EAGLES, 8:30 PM (ET) Dallas - None Philadelphia - None ' ' '