Trading Filppula also freed up a spot on the protection list for the NHL Expansion Draft. Filppula, who had a no-movement clause in his contract, would have had to have been protected.
"Really, [Filppula's] trade is more about next year because he is signed for another year and we have our players to sign," Yzerman said. "Our decision was, 'OK, we have an opportunity to move him here. Do we want to do that now, or should we wait until the summer and do it?'
"We decided we have an opportunity now, so we should do it, because you don't know what's going to happen in the summer. Potentially we're in a position where we might have to move somebody else or might have to give up assets to move someone. We felt like we should exercise this opportunity now, and we did that."
Yzerman is not done making hard decisions.
"The cap is going to be an issue again for us next year," he said. "It will dictate some of the decisions we make between here and the start of next season."
But the Lightning are not done competing, now and in the future. Entering Tuesday, they were two points behind the New York Islanders for the second wild card into the playoffs from the Eastern Conference, with two teams in between. Yzerman wants more leadership from Drouin. He wants more from players like Adam Erne and Vladislav Namestnikov.
"It doesn't mean we're just giving up on the season," Yzerman said. "We try to look at it and say, 'You know what, guys? We're still trying to make the playoffs here. We're going to try to win every night. You younger guys, you're going to get more opportunity. Take advantage of this opportunity.' "