"Family. Friends. I'm a local guys, so this is my home team," said Jacobs, who grew up in the Bay Area.
The first big hurdle for Jacobs next week, when NFL preseason rosters are cut from 90-75.
Jacobs had 2 catches for 27 yards in the 49ers first preseason game against the Denver Broncos last week.
With Micheal Crabtree likely out for the season due to an achilles tear, Jacobs has an outside chance of making the 49ers.
"I just have to stay on my playbook and put my best foot forward," Jacobs said. "And just make sure I make plays when they present themselves."