Bruins fans, who might have seen their dreams of a Stanley Cup vanishing Sunday afternoon as center David Krejci was helped off the ice in Pittsburgh with what looked like a serious right knee injury, could breathe a sigh of relief yesterday. It didn’t look good for Krejci when he was nailed by a Johnny Boychuk slap shot and lay on the ice, writhing in pain. But he was lucky to avoid serious injury, and there’s a chance he will play tonight against the Jets. “He’s day-to-day,” B’s coach Claude Julien said after his team’s brief optional skate here yesterday. “He’s getting treatment, and day-to-day means we’ll see how he is (today). There’s no broken bones.” Julien hinted that a decision quickly would be made about a potential replacement, and later in the afternoon, the Bruins announced that talented rookie center Ryan Spooner will make the trip to Manitoba. His recall is on an emergency basis, meaning he’ll stay until Krejci is ready to play. Spooner has had an outstanding season for the Baby B’s, leading them in scoring with 12 goals and 33 assists in 50 games. The 21-year-old, a second-round pick (45th overall) in 2010, played his first and only NHL game in Montreal on Feb. 6. If Krejci, one of nine key Bruins who did not skate yesterday, responds well to treatment, it’s possible he’ll play tonight. If not, the B’s don’t think he’ll be shelved for long. “We’re hoping he’ll be back soon,” Julien said. “It’s nothing serious to the point where we’re talking weeks. “It’s the same thing as (injured center) Chris Kelly: Even though he’s out for a while, we all know it could have been a lot worse. Same thing with David. Considering where he got hit, it could have been worse. But right now we’re dealing with a day-to-day situation. We’ll see how he feels (today) and go from there.”