Getting past the swine flu maybe the easy part of David Krejci’s week. Now the third-year center needs to get his offensive game back in order.

Krejci returned to lineup in Tuesday’s 3-0 victory over Pittsburgh. With him having not been able to skate for five days while recovering from the HINI virus, it was not surprising that his game was slightly off.

“I felt my legs were a little out of shape,” Krejci said after getting in some extra skating at the conclusion of practice in Wilmington Wednesday.

Centering a line with Michael Ryder and Blake Wheeler on the wings, Krejci logged just over 17 minutes of ice time against the Penguins, generating two shots on goal.

“We had some good chances, but I didn’t feel that great all game. My legs weren’t there,” Krejci said. “I was thinking too much. What to do with the puck, it should just be [instinct]. Tomorrow, I’ll do everything I can to make it work.”

It certainly would be a good time for Krejci to jump start his game.

After finishing as the Bruins’ second-leading scorer last season (73 points), Krejci inked a three-year, $11.25 million contract extension this summer. He has just five points (1 goal, 4 assists) in 15 games this season.

Bruins coach Claude Julien was quick to stress Wednesday that Krejci needs to raise his game.

“His game is certainly not where it should be,” Julien said. “That’s up to him to work through it. He’s at that stage where he needs to find his game and work through the glitches that he seems to have right now.”

Added Julien: “There’s no doubt he’s pressing. Sometimes when guys press they don’t take the right approach to get themselves out of it. My approach is always to work hard, work through it, things will turn around.”

For his part, Krejci seems ready to help lead the Bruins offense.

“That was my plan coming into the season, things didn’t go the way I wanted but you have to start somewhere. It’s not too late,” he said. “I’m trying to stay positive about being able to develop my game.”

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Defenseman Derek Morris was held out of practice after coming down with the flu Tuesday.

“We just gave him the day off,” Julien said.