The extra two days weren't enough for the Browns Juan Lagares Jersey to get a reinforcement under center.Neither nor tested out of COVID-19 protocols, leaving to start on against the Raiders, NFL Network's Tom Peli sero reported.Mayfield and Keenum have been on the reserve/COVID-19 list since last week, when landed more than 20 players on the list. in the interest of player safety from Saturday afternoon to Monday, but Cleveland has only seen a few players return from the reserve/COVID-19 list in that time, including safety .Browns coach Coach Kevin Stefanski, , also will be unavailable Monday, NFL Network Insider Ian Rapoport reported.There was hope that Mayfield and/or Keenum would make it back in time to face Las Vegas in a game that is very much important to Cleveland's playoff hopes. With a Nolan Ryan Jersey win, the Browns can move into , while a lo s would drop them to last place.Despite the lack of name recognition, Mullens has starting experience in the NFL. The quarterback has appeared in 19 regular-season games, starting in 16 of them and completing 64.5% of his pa ses for 4,714 yards and a 25-22 TD-INT ratio.He David Wright Jersey also has some history playing against the Raiders in his four-year profe sional career. The former Southern Mi si sippi star made his regular-season NFL debut in 2018 versus the Raiders, completing 16 of 22 pa ses for 262 yards and three touchdowns while leading the San Francisco 49ers to a 34-3 win over the team that called Oakland home at that time. The performance was stunning and helped preserve Mullens' employment with the 49ers through the 2020 Adrian Gonzalez Jersey season before it became clear he wouldn't be a viable long-term option for them moving forward.Mullens has spent 2021 on the Browns' practice squad and was elevated to the active roster to back up Keenum in Cleveland's Week 7 win over Denver, a game in which Mayfield was unable to play due to injury. Now he'll have to go without either of them available in a pivotal contest in front of a national audience.The Raiders will be without Asdrubal Cabrera Jersey rookie cornerback , who was placed on the reserve/COVID-19 list Monday.