Jimmy Garoppolo suffered a torn ulnar collateral ligament of the right thumb, as well as a fracture in the same thumb early in the San Francisco 49ers' 20-17 loss at the Tennessee Titans.

Garoppolo did not participate in the Niners' Monday "bonus" practice, which came after the team went its separate ways for the three days following the loss in Nashville. 

Trey Lance took all the work with the starters on Monday.

Garoppolo finished the game but struggled with a pair of costly interceptions and missed a would-be touchdown throw to open fullback Kyle Juszczyk in the first half.

With Garoppolo considered day-to-day, Lance could be in line for his first extended work with the starters since before a Week 5 loss to Arizona.