"Confident or not confident, I don't know. We are not close to a deal for Aubameyang with Dortmund or anybody else," he told reporters in his pre-match press conference ahead of the EFL Cup semi-final with Chelsea on Wednesday.
"You never know how close you are. At the moment it's one of the possible movements, the final decision is not made."
Aubameyang has scored 21 goals in 23 appearances across all competitions for Dortmund so far this season.