McCoy will be taking over at quarterback for the 6-3 Redskins, who looked like they might have been on their way to winning a weak NFC East.
Gruden said Monday that Sanchez was the pick to sign over Kellen Clemens, Josh Johnson, T.J. Yates and EJ Manuel because of his experience and success in the NFL. The failed Jets QB was apparently at the top of the list, due to his familiarity with some members of the Redskins' coaching staff.
The Redskins quarterback broke both major bones in his right leg Sunday, ending his season, perhaps threatening his career and eerily echoing another horrific leg injury by a Redskins quarterback.
Redskins quarterback and former Kansas City Chiefs quarterback Alex Smith's season is over.
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Sanchez served as the Cowboys backup quarterback behind Dak Prescott in 2016.
Alex Smith's first season in Washington ended six games early. In 2011-12 - his last two seasons as New York's starter - Sanchez threw a combined 36 interceptions and fumbled 16 times. Redskins legend Joe Theismann had his leg broken on November 18, 1985.
The Sanchez signing will come at nearly the exact six-year anniversary of the Butt Fumble Game, which took place on the night of Thanksgiving in 2012.
Sanchez's exploits, and blunders, in the National Football League are well-documented. Smith, who was immediately in devastating pain, was quickly carted off the field and was reportedly headed to surgery just minutes after his team's comeback bid fell short.