The announcement was made by the Boston Bruins and the Czech Ice Hockey Association.

The Czechs have registered three goaltenders and 19 skaters up to this point, and can add another skater up to two hours before a game to fill the roster.

Pastrnak was injured for more than seven weeks and returned to Boston from a two-game conditioning stint with the AHL’s Providence Bruins. Before suffering a foot injury, Pastrnak had played 10 NHL games in October scoring two goals and notching four points.

Pastrnak was a healthy scratch in last night’s game and Bruins GM Don Sweeney announced that unless there’s an injury to another player, Pastrnak would get the green light to join the Czech team once the roster freeze in the NHL from 19 to 27 December ends.

“Obviously the injury took longer and it was in his best interest to make sure he was fully healthy. He is fully healthy and now we need to get him back to where he would impact our lineup,” Sweeney said, according to the Bruins’ website.

“We think that based on last year, his experience there in the tournament, the confidence that he had, that he’ll come back to the full level that he really had gotten to last year, impacting our lineup.

“I think the opportunity for him to go play really heavy minutes in all situations, at a very, very high level, competitive level, against his peers, I think is a unique situation – with the timing and such, with the freeze, his injury and things all collided at once. I think it’s a great opportunity for him.”

Pastrnak is expected to arrive in Helsinki on Monday, although it’s not clear whether he will play in the game against Slovakia.

“I’m looking forward [to the World Juniors], although the transition to the wider ice sheet and junior hockey won’t be easy, but I want to help as much as I can,” Pastrnak told hokej.cz. “It’s always nice to wear the national team jersey. I’m glad to play my third World Juniors. It’s an honour.”

The 19-year-old winger will be arguably the most experienced player in the tournament. A first-round draft pick (25th overall) by the Bruins in 2014, Pastrnak is in his second season with the Bruins. He played 46 NHL games (10 goals, 17 assists) last season.

Pastrnak played in the last two World Juniors, combining for two goals and eight assists in ten games. He also played in two U18 World Championships, winning a silver medal at the 2014 IIHF Ice Hockey U18 World Championship in Lappeenranta and Imatra, Finland, after losing the final to the U.S.

Now Pastrnak and the class of 1996 will hope for another medal run in Finland, this time with the U20 team.