The San Francisco 49ers promoted tight end Derek Carrier to the active roster Saturday.
Starting tight end Vernon Davis is questionable for Sunday's game at the New Orleans Saints because of a concussion. He was a limited in practice during the week. Davis' backup, Garrett Celek, is doubtful with a hamstring injury.
Carrier, 23, joined the 49ers' practice squad Sept. 3 after brief stints with the Oakland Raiders and Philadelphia Eagles.
The 49ers have four tight ends on their roster.