The 49ers signed Hubbard (biceps) to a one-year, $1.38 million contract Tuesday, Ian Rapoport of NFL Network reports.
The Titans placed Hubbard (biceps) on injured reserve Saturday, Jim Wyatt of the team's official site reports.
Hubbard (biceps) has been ruled out ahead of Sunday's game against the Panthers, Jim Wyatt of the Titans' official site reports.
Hubbard will not return to Sunday's game after suffering a left elbow injury, Jim Wyatt of the Titans' official site reports.
Hubbard (concussion) is listed as out for Thursday's game at the Steelers.
Hubbard (concussion) has been ruled out for the rest of Sunday's contest against the Falcons, Paul Kuharsky of PaulKuharsky.com reports.
Hubbard doesn't have an injury designation ahead of Thursday's matchup against the Steelers, Scott Petrak of the Elyria Chronicle-Telegram reports.
Hubbard (illness) has been ruled out for Sunday's game against the Lions, Mary Kay Cabot of The Cleveland Plain Dealer reports.
Hubbard participated fully in practice Wednesday, Zac Jackson of The Athletic reports.