The Bruins confirmed everybody’s worst fears on Wednesday afternoon by announcing that Selke Trophy-winning center Patrice Bergeron suffered a “moderate” concussion in the second period of Tuesday night’s 3-2 win over the Ottawa Senators at TD Garden.

There is no timetable for his return.

General manager Peter Chiarelli said Bergeron -- whom he described as emotional in the wake of the injury, which occurred when he was inadvertently elbowed in the head by Ottawa's Colin Greening -- was out walking Wednesday and was in good spirits, but was “annoyed” after suffering the fourth concussion of his nine-year career.

"We will work together at getting you well,” Chiarelli said he told Bergeron.

The Bruins are clearly hoping that it’s a concussion similar to the one that caused him to miss only a couple of playoff games during Boston’s run to the Cup two years ago, rather than something with longer-lasting effects.

The two-way center and alternate captain missed 12 days after suffering that playoff concussion in 2011. He then went almost two years before suffering another head injury.