Kuznetsov has not played since May 1 after being placed in protocol. Eller was injured during the second period of Game 2 on Monday.
"We've got some decisions to make, lineup decisions that we'll work through here," coach Laviolette said.
Forward T.J. Oshie, who can play center, did not skate Wednesday but is in the lineup.
"I think that's something we've been facing all year," Capitals forward Nicklas Backstrom said. "Guys have been in and out, but I think we're a deep group here. I feel like we've bonded well, all of us, like the taxi squad as well. They're ready to jump in or out of the lineup. That's just part of the playoffs."