The running back’s ability to return to the game hasn’t alleviated Shanahan’s concern that it could be serious.
“I don’t know, you never know,” Shanahan said. “I mean, adrenaline on these days during games is a little bit different. We’ll find out more tomorrow.”
Mason rushed for 73 yards on nine carries, increasing his NFL-leading season rushing total to 609 yards.
In his absence, rookie Isaac Guerendo and Patrick Taylor, along with wide receiver Deebo Samuel, filled in at running back with the operation chugging along. The 49ers produced 228 yards rushing, 155 coming from runners other than Mason.
Just how serious Mason’s ailment is remains to be seen.
