The team's starting goaltender skated at Monday's practice at Honda Center after receiving treatment during the team's off-day Sunday.
After Gibson suffered an upper-body injury in a game against the Colorado Avalanche on April 1, Ryan Miller started three consecutive games to cap the regular season.
"We fully expect if he continues to show this progression that he's going to be available to us" for Game 1, coach Randy Carlyle said. "He's moving well, so hopefully things continue to progress at the same rate they have over the last 48 hours and then we'll make a decision.