Sam Darnold has missed multiple practices for the New York Jets this week with an illness being described as mono. The illness may be more serious than first thought with Darnold being ruled out of Monday night's game against the Cleveland Browns, per Rich Cimini.

Darnold missed Jets practice on Wednesday, which is never a good sign for a player's availability for that week. Along with missing Monday's game, the second-year quarterback could be out until Week 4 against the Philadelphia Eagles according to Manish Mehta.

https://twitter.com/MMehtaNYDN/status/1172156592365670405?s=20

Trevor Siemian appears poised to start in Darnold's place against Cleveland. Furthermore, Siemian hasn't started in an NFL game since Week 15 of the 2017 season. His last start came during his time with the Denver Broncos.

As for Darnold, the 22-year-old quarterback has gotten off to a rough start to his second season in the NFL. The Jets expected their first-round pick from the 2018 NFL Draft to show improvements under new head coach Adam Gase in 2019.

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In Week 1, Darnold finished the game with 175 yards and a touchdown as New York fell to the Buffalo Bills by the score of 17-16. Just days after the game, the Jets signal-caller began to show symptoms of having mono.

Throughout the week, Gase noticed that his franchise quarterback looked lighter and that he had lost weight due to the sickness. Therefore, the Jets head coach decided to take a cautious approach with his young quarterback.

The Jets have been preparing this week without Darnold so they knew it was a possibility he could miss Monday night's game. Fans in New York shouldn't expect to see their starting quarterback in Week 3's matchup against the New England Patriots either.