Filppula, who hyperextended his elbow during a 5-0 loss against the Boston Bruins on March 19 and has missed seven games, was a full participant at practice Wednesday. The 35-year-old center has 29 points (15 goals, 14 assists) in 71 games this season, his first with the Islanders.
New York (46-27-7), which clinched a playoff berth with a 5-1 win against the Buffalo Sabres on Saturday, is in second place in the Metropolitan Division, three points behind the Washington Capitals and two ahead of the Pittsburgh Penguins. Each team has two regular-season games remaining.
The Islanders finish their regular season with two road games; against the Florida Panthers at BB&T Arena on Thursday (7 p.m. ET; FS-F,MSG+, NHL.TV) and at the Capitals on Saturday.
"It didn't feel good, so I figured something's probably going on," Filppula said. "But I'm happy for this quick to be feeling this good.
"Today was the first practice, so we'll see how it's going to go. Everything felt good today, so I'm happy with that."