In a shocking development, New York Jets head coach Adam Gase told the media on Thursday that quarterback Sam Darnold would miss Monday night's primetime matchup with the Cleveland Browns due to mono. Gase knew that this news was going to surprise people, and appeared upset as he delivered the update. "And then [Darnold] ... has mono. He will be out for this game," said Gase. "So Trevor (Siemian) will be starting and Luke Falk will get elevated at some point and be the backup. So, that will be that." To make matters worse, Darnold has already lost weight, and Gase made it seem like his franchise quarterback is going to miss several games. Per Rich Cimini, Gase mentioned that he's glad the Jets have a Week 4 bye, which could suggest that he's not counting on Darnold until Week 5 when the Jets travel to Philadelphia. SUBSCRIBE TO OUR CHANNEL: https://www.youtube.com/user/CBSSports FOLLOW US ON: Facebook - https://www.facebook.com/CBSSports/ Instagram - https://www.instagram.com/cbssports/ Twitter - https://twitter.com/CBSSports #BreakingNews #NYJets #SamDarnold #DarnoldOut #DarnoldMono #TheDarnold #AdamGase #LeveonBell