NFL teams are playing no more head games.In the wake of the frightening Tua Tagovailoa head injury suffered in the Dolphins' Week 4 matchup vs. the Bengals, the NFL seemed to tighten up its concu sion protocol standards quite a bit on Sunday.A dozen players acro s the league were sent to the medical tent and ruled out of their respective contests after sustaining potential head injuries. The list is a curious one, and seems to favor one side of the ball more than the other.With the NFL and the NFLPA looking to amend the concu sion protocol rules to remove any kind of gray area when it comes to concu sions sustained during the game, the list David Robinson Jersey of players to hit the medical tent (and the locker room) on Sunday ballooned.MORE: The complete list of players who were evaluated for concu sions and ruled out on Sunday:Blake Cashman, TexansCashman was removed in the second quarter of their matchup vs. the Chargers. Lovie Smith confirmed following the game that the linebacker suffered a concu sion.Tyrod Taylor, GiantsThe Giants' backup QB entered the game after Daniel Jones suffered an ankle injury, but would sustain a head injury of his own, forcing Saquon Barkley in as the team's emergency backup.MORE:Julian Love, GiantsLove was injured in a one-on-one collision with running back Tristan Ebner. After attempting to stay in the game, Love was escorted by officials to the sideline, and was later taken to the locker room, where medical officials confirmed a concu sion. Following the game, Love tweeted that he'll "be back soon."Im all good. Will be back soon. Appreciate the support Julian Love (@julianlove27) Shaquille Leonard, ColtsThe linebacker was diagnosed with a concu sion in their matchup vs. the Texans. Leonard was playing in his first game after mi sing the preseason while recovering from back surgery.Leonard and teammate Tyquan Lewis, who also emerged from the game with concu sion symptoms, already have been ruled out for Thursday's short-turnaround game against the Broncos. ESPN's Stephen Holder said the team made that call "independent of the concu sion protocol."The Colts have ruled out Shaquille Leonard and Tyquan Lewis who are both suffering concu sion symptoms.This decision was made independent of the concu sion protocol. Team decision.Obviously relevant given recent events in Miami. Stephen Holder (@HolderStephen) Denzel Perryman, RaidersPerryman made his return to the Raiders after suffering a Week 1 ankle injury, but would exit the game after suffering a concu sion.Brian Hoyer, PatriotsHoyer was starting in place of an injured Mac Jones (high-ankle sprain), and was , ultimately confirmed as a concu sion. Bailey Zappe relieved Hoyer.MORE:Isaiah McKenzie, BillsThe Bills slot receiver was injured in the third quarter against the Ravens.Terrell Edmunds, SteelersEdmunds injured himself in the second quarter of the Steelers' matchup vs. the Jets, colliding with running back Michael Carter and teammate while in pa s coverage.Adrian Amos, PackersThe veteran Packers safety exited Sunday's game against the Patriots after making a tackle on Damien Harris.P.J. LockeandAaron Patrick, BroncosThe Broncos defenders were both placed in concu sion protocol, and ruled out.Cameron Brate, BuccaneersThe Bucs tight end left the game, was evaluated for a concu sion, came back in, and was later removed from the game to enter concu sion protocol. A curious series of events for Brate, who was removed in the second quarter.MORE:Correlation isn't causation, but there are a few notes of interest: Of the dozen players placed in concu sion protocol, four saw their first action after extended absences (Leonard, Taylor, Hoyer, Perryman).Also, more defenders were placed in concu sion protocol than offensive players, with eight defensive players being placed into concu sion protocol as opposed to four on the offensive side of the ball.Also, given the Tagovailoa investigation, it's curious timing to see so many players hit concu sion protocol. Coincidences don't exist, though, and especially not in the NFL. Fabricio Oberto Jersey