This means that he will miss both the premiere and the start of the SHL season.
If he is out for six weeks, it means that he will miss nine matches.
Brynäs has brought home the forward duo Jakob Silfverberg and Oskar Lindblom from NHL and Djoos from the Swiss league ahead of their return to SHL. Three big profile acquisitions for the newcomer.
Christian Djoos, Stanley Cup champion with Washington in 2018, has not been able to train on ice for the past two weeks and now the news comes that he will be out for a longer period.
"It's of course sad that we will have to manage without Christian for a while, we naturally hope to have him back in play as soon as possible", says sports manager Johan Alcén on the club's website.
Brynäs will meet Linköping away in the SHL premiere on September 21.