The Poland international is reported to be unhappy that the club refused to sell him to Bundesliga rivals Bayern Munich this summer.
"Whatever is left to be discussed will be discussed internally," Klopp told reporters. "The idea is to close this subject. Everything is in order.
"Nothing has changed since yesterday or the day before yesterday. I am convinced we will clear up everything in the coming days.
"For me what he does [on the pitch] is a thousand times more important than what he says, because what he does needs no interpretation."
Dortmund kick off their new Bundesliga campaign against Augsburg on August 10.