Koeman's contract carries a clause which would allow him to move to Barca after the 2020 Euros.
"I have two more years left on my contract with the [Dutch] national team and I do not like to talk about Barcelona," Koeman said at the event.
"It's uncomfortable for a lot of reasons; I currently have a job and it's not fair to talk about this.
"If they come, they come; and if they don't, they don't. There are more important things [to worry about] in life."
During the event, Koeman hinted that he would be open to taking charge at the Camp Nou.
"Anything can happen," he stated.