Washington Commanders quarterback Jayden Daniels will be sidelined indefinitely after dislocating his left elbow in Sunday's 38-14 loss to the Seattle Seahawks, sources told ESPN's Adam Schefter.However, it's not certain that the injury will end his season, Schefter adds.The quarterback is slated to have an MRI on Monday to confirm the diagnosis and figure out how much time he'll miss, Schefter reports.Daniels sustained the injury after being tackled during the fourth quarter of Sunday night's game. The Commanders trailed 38-7 at the time. He exited with his left arm in a cast.Daniels wasn't the only player lost for Washington. Starting cornerback Marshon Lattimore is feared to have torn his ACL during the loss, NFL Network's Ian Rapoport and Mike Garafolo report. Wide receiver Luke McCaffrey also broke his collarbone and will end up on injured reserve, according to Rapoport.The injury bug has plagued Daniels' second NFL season. The reigning Offensive Rookie of the Year had already missed one game with a hamstring injury and two contests with a knee sprain prior to Sunday.Marcus Mariota is expected to receive starting duties in Daniels' absence. The veteran has thrown four touchdowns and four interceptions this season, and the team is 1-2 in his three starts.The Commanders sit third in the NFC East with a 3-6 record.  
                                
                                
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