Mariano Rivera

Orioles notes: Closer Zach Britton to receive stem-cell injection in left knee Friday

Orioles notes: Closer Zach Britton to receive stem-cell injection in left knee Friday

Orioles closer Zach Britton will receive a stem-cell therapy injection in his left knee Friday to help the recovery of an MCL strain that has become more painful over the past few weeks.

The injury, which will likely end Britton’s injury-hindered season, was revealed during an exit physical MRI this week. The timing of the injection is to accelerate his offseason recovery so the knee isn’t a problem when he reports for spring training in February for his final season before he’s set to become a free agent.

“It showed that it had gotten a little bit worse and that’s why we’re taking the steps we are now,” Britton said Wednesday night. “Nothing drastic, but...