It was at Tuesday's training that 33-year-old Carl Hagelin was hit by a club in the eye.
The Swede underwent an operation on Wednesday and will see another eye doctor, according to Wasington Capital's general manager Brian MacLellan.
- Visibility is our biggest concern.
We were really worried yesterday.
I do not really know, it is at least positive that the investigation went in the right direction.
But it remains to be seen what is the next step and how can be affected by it, he says according to nhl.com.
Hagelin - who is making his fencing season in the Capitals - will now be gone for a long time.
- First and foremost, we worry about him and his well-being.
Secondly, if we think about our team, he is a player we will really miss.
He has shouldered a number of different roles and his chain has been excellent.
In my opinion, he is one of the league's best players in boxplay, says MacLellan.