"[Johnson] is getting closer," Cooper said. "Our lineup is not changing from [Monday]. After tonight there's six games left, so yeah, guys are progressing, but we need them back now."
Johnson or Stamkos could return sometime this weekend, when the Lightning play back-to-back home games against the Montreal Canadiens on Saturday and the Dallas Stars on Sunday.
The Lightning, who have won three straight and are 7-3-0 in in their past 10 games, are three points behind the Boston Bruins for the second wild card into the playoffs from the Eastern Conference. The Lightning have one game in hand; the Bruins have five more regulation/overtime wins.
Johnson, who has 44 points (19 goals, 25 assists) this season, said he expected to be on the ice earlier but his recovery has taken longer than anticipated, which has forced him to be a spectator with Tampa Bay competing for a playoff berth.
"I've always said it's tough watching hockey," Johnson said. "It's inspiring to see the way the guys have been playing, but tough having to watch it and not to be out there and not being able to contribute. Especially this time of the season and where we're at [in the standings]. Every game matters and every point matters, so it's tough watching."
Stamkos was a full participant in practice Wednesday before taking part in the optional morning skate Thursday.
"It's as close as I've been," Stamkos said Wednesday. "I'm not going to put any dates on anything, but I'm just very pleased and excited with how it's feeling. I'm very optimistic about being able to get where I need to be sooner rather than later."