Asked if he was worried about his position following Bartomeu's resignation, Koeman said that was not the case.
"No. We have to channel all of our energies into playing football. Off-field issues are out of our hands," he told reporters, via AS.
"If my situation changes in any way, I hope that I am told about it. We want to gain better results and improve the way we play. That is what we are putting all of our efforts into doing. Everything outside of that is out of our control. We'll see what happens.
"I am not liberated by what has happened, not at all. We all have our own thoughts on what happened.
"The team showed that it hasn't affected us – if it had, we wouldn't have put in a game like we did."
Barca have only suffered one loss in their past 18 Champions League group stage games away from home, including going unbeaten in 11.
Koeman hopes Bartomeu's exit has no impact on his side, who visit Deportivo Alaves on Saturday.
"We have to think about the sporting side. After the president's decision, the team played well," he said.
"Hopefully it won't affect us."