Gase confirmed Siemian suffered ligament damage to his left ankle when Myles Garrett tackled him in Monday's 23-3 defeat to the Cleveland Browns.
With Sam Darnold still out with mononucleosis, Luke Falk will be the Jets' starting quarterback for their Week 3 encounter with the New England Patriots.
Falk made a good account of himself, finishing 20-of-25 for 198 yards. The Jets trailed 13-0 when he entered the game in the second quarter, so he deserves little blame for the one-sided outcome.
Life in the pocket is bound to become more difficult for Falk on Sunday.
The Patriots outscored the Pittsburgh Steelers and Miami Dolphins 76-3 in their first two games. They also allowed 5.4 passing yards per attempt—second-fewest in the NFL—and held quarterbacks to a league-low 43.8 passer rating.
The Jets will need to sign another quarterback this week to back up Falk. Le'Veon Bell was the team's emergency QB had Falk gone down with an injury after Siemian on Monday night.
SNY's Ralph Vacchiano noted Darnold was at the Jets' facility Tuesday but that his return to the field "probably isn't close." New York has a bye in Week 4, which will allow Darnold more time to recover after the Patriots game.
Jacksonville Jaguars quarterback Gardner Minshew II, a rookie out of Washington State University, has become an overnight sensation after replacing the injured Nick Foles. Perhaps Falk, also a Washington State alum, can follow his example in making the most of a tough situation.