The Boston Red Sox have added Chris Young to their ALDS roster to replace the injured Eduardo Nunez.

Nunez, who was back in the lineup for Game 1 against the Houston Astros on Thursday after missing all but one of the final 20 regular-season games, had to be carried off the field in the first inning after aggravating a sprained ligament in his right knee.

"We did a lot of treatment, a lot of simulated games, we did everything we can to be ready," he said. "We obviously know now my knee's not ready yet."

Nunez will be eligible to return later this postseason.