Knuble is playing on Alex Ovechkin's line Sunday night. Also in Washington's lineup is defenseman John Carlson, who left in the third period of Game 1 on Friday.
Knuble missed the last two games of Washington's series against the Rangers, and Game 1 against the Lightning, with a suspected hand injury. His 24 regular-season goals ranked third on the Capitals.
Defenseman Randy Jones and center Blair Jones played for Tampa Bay on Sunday for the first time this postseason.