Jets Quarterback Sam Darnold Out Indefinitely After Contracting Mono

New York Jets quarterback Sam Darnold throws a pass in the first half of the preseason game against the New York Giants on Thursday, August 8, 2019, in East Rutherford, New Jersey. (AP Photo / Michael Owens)

New York Jets quarterback Sam Darnold will be sidelined indefinitely after being diagnosed with mononucleosis, coach Adam Gase announced Thursday. Trevor Siemian will start Monday night against the Cleveland Browns.

The Jets, who lost starting wide receiver Quincy Enunwa to a season-ending neck injury this week, could be without Darnold for multiple weeks.

“Looks like it,” Gase said. “Good thing we’ve got an early bye week.”

The bye week falls in Week 4, following an away game against the New England Patriots. Darnold’s earliest likely return is Week 5 at the Philadelphia Eagles.

Darnold isn’t the only concern on offense.

Running back Le’Veon Bell underwent an MRI on Thursday to evaluate shoulder soreness, though a source told ESPN’s Jeremy Fowler that no major damage or tear was found.

Gase didn’t sound alarmed about Bell, saying, “We don’t think it’s anything worse than [soreness]. We’re just trying to be a little extra cautious.”

Darnold received the diagnosis late Wednesday night, when Gase, offensive coordinator Dowell Loggains and a trainer showed up at his apartment near the Jets’ facility.

“He knew something was up, when Dowell and myself showed up,” Gase said of his second-year quarterback, who didn’t practice Wednesday because of what the team called strep throat. “I wanted to make sure [the news] was delivered myself. I figured I could be the bearer of bad news on this one.”

Weight loss and extreme fatigue are the most common symptoms with mononucleosis, which has been known to last multiple months in some cases.

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SOURCE: ESPN, Rich Cimini