Krejci is scheduled to return tonight when the Bruins play host to the defending Stanley Cup-champion Pittsburgh Penguins at TD Garden.

“It wasn’t very good [last week] but I feel better now,’’ said Krejci, who worked out off the ice Sunday. “The last three days I didn’t have any fever. I still had a little headache but I felt pretty good and I did a 20-minute bike ride back home and woke up this morning and I felt pretty good.’’

Krejci was aided by the fact he’s young and in professional athlete-caliber condition. He said the worst part was having to be isolated from everyone he knows. The only way he could converse with teammates was by text messaging.

“It wasn’t very fun, I don’t want to go through it again,’’ he said. “It was long, I got bored. I’m happy it’s behind me and I’m back with the guys here.’’

Krejci said the time passed very slowly during his illness.

“Game days, Thursday and Saturday, I thought it was 7 p.m. but it was 1 p.m. so I was just counting the hours until the game was going to start,’’ he said. “It was pretty long. I got through it and it’s behind me now.’’

In terms of skating, he said he felt a little rusty but other than that, all systems were go.

“I’ll be good [today],’’ he said.

Unfortunately for the Bruins, however, they were without forward Michael Ryder. Coach Claude Julien said Ryder wasn’t feeling well but his illness is not the H1N1.

“He’s a little under the weather,’’ Julien said. “There are no H1N1 symptoms if that’s the thing that people want to know. Every time somebody’s going to be a little under the weather at this point, we’re going to play it safe and get him checked out. There’s nothing indicating it’s got anything to do with that.’’

“I guess they’re getting better as scheduled, if I can put it that way,’’ Julien said. “Both guys are progressing. With Marc, it’s a little more delicate because it’s a foot but once he gets the boot off and he’s cleared, he can start skating and from there on in, hopefully, it will go fairly quick. Milan is obviously getting to the point where he’s going to start handling some pucks, so they’re both progressing as scheduled.’’

Julien said he couldn’t hazard a guess as to whether Lucic is further along in his recovery.

“That all depends,’’ said the coach. “There’s a broken finger there and if there’s vibration and everything else every time he shoots, it’s not a good situation, so I don’t know how quickly it will heal.’’