He is expected to miss the remainder of the season.
The San Francisco 49ers quarterback is done for the year after an MRI revealed that Jimmy G. tore his ACL in the fourth quarter of Sunday's loss to the Kansas City Chiefs, according to ESPN's Adam Schefter. Garoppolo was on the turf for a couple of minutes before he was helped to his feet and eventually carted off late in a 38-27 loss to Kansas City.
The team now has only two other quarterbacks on the roster. The team had acquired him in a trade with the New England Patriots during the middle of last season for a second round pick.
The injury deals a serious blow to the 49ers (1-2), who had planned their rebuild around Garoppolo and now must turn again to C.J. Beathard at quarterback.
Garoppolo had completed 59.6 percent of his passes with five TDs, three interceptions and an average of 8.1 yards per attempt for a 90 passer rating.
CJ Beathard will be in line to start right away, but head coach Kyle Shanahan did say the team needed a third quarterback in the building. He has five passing touchdowns and seven interceptions in his career.