Reed didn't return to the game after going to locker room for treatment during the Ravens' 44-13 victory over the Cincinnati Bengals at M&T Bank Stadium.
"It strained my hamstring trying to dive," Reed said. "You know I'm 34 in two hours. Father Time does catch up with you. It's good, it's good. It's minor."
Reserve cornerback Corey Graham limped off the field with the assistance of trainers due to a leg injury, but wasn't listed on the injury report afterward. It's not considered serous.
Defensive end Pernell McPhee had an ice pack on his surgically repaired right knee, but said it was just for precautionary reasons.
McPhee had arthroscopic knee surgery during the spring.
"It's fine," McPhee. "I'm just being careful with it."