First baseman Nick Swisher's left shoulder is hurting and could put him on the disabled list.

Swisher aggravated the shoulder in the fifth inning Saturday night during an at bat in the Indians' 7-6 loss to the Nationals.

"I'm grinding guys," said Swisher. "I want to be in there every day regardless of what I got going on. Obviously, it's starting to physically show a little bit."

Swisher missed time earlier in the season because of shoulder soreness.