The German is obviously still reeling from his friends exit.
Leeds United started the season with something of a positive air. The fans were ready to put the rollercoaster disaster ride that was the 2014-15 campaign behind them and move on with the impressive new structure that owner Massimo Cellino had put in place.
Until, out of nowhere, Pearson left the club as he could no longer juggle dual roles with his similar position at Hull F.C rugby league club.
It was a decision that left Cellino and Rosler upset and now the German has opened up on the impact his departure had on the club and himself.
He told BBC Radio Leeds last night:
"The negative surprise was that Adam Pearson left us because I felt we were, on all fronts, starting to progress. Good people, experienced people, put in the management structure. Everyone started to work with each other very well. That hit me a little bit out of the blue.
"I see myself best when I can concentrate on my players. On my coaching and work at the training ground, concentrating on the key members of staff and have an input in recruitment and the rest was left, more or less, for Adam, which I was very comfortable with.
"Now, as Adam is not there, more questions come to me as well in certain areas. I think at times I have to go to the owner with things I don't really want to go to the owner."
"Building a football club he is experienced, winning promotion with a football club he is experienced, establishing a football club in the Premier League. I call him a friend and he gave me advice in many ways."
Cellino has already made it clear that he will not be filling the gap left by Pearson for the time being, preferring to leave the role open if he was to have a change of hearts over his decision to leave.
Rosler clearly prefers to have someone above him, a middle-man between the manager and owner, so perhaps that is an ideal that should be revisited by the maverick Italian.
For now Rosler will simply need to improve results and performances on the pitch if he wants to keep hold of his employment at Elland Road.