Chelsea and Newcastle United are reportedly keen on bringing Pierre-Emerick Aubameyang to the Premier League, according to the Express.
Aubameyang who only signed from Saint-Étienne last summer has failed to break into the Borussia Dortmund side on a regular basis. The striker who scored 13 goals was coveted by the Geordie club even during last summer's transfer window.
However, Mourinho who reportedly made an enquiry about the striker in May after seeing the Blues strikers fail to impress during the last campaign was told that the Gabon international was not for sale.
Dortmund's CEO Hans-Joachim Watzke made it clear that Aubameyang was not leaving the club. He went on to state that the player had a contract and that the club were satisfied with him.
"Why should he be leaving? He has just played here for one season," Watzke said, as quoted in the Express.
"We did not believe he would be put up [in the team] from the start in every match for our club. We have an immense competition for places in the first team, this was impossible for him."
"We are content with Aubameyang, he has a contract left at our club," the Dortmund CEO added.
Dortmund, who lost star striker Robert Lewandowski to Bayern Munich on a free transfer, have quickly moved and brought in Torino's Ciro Immobile to replace him. This seems to have made the German club have a change of heart and they are now prepared to let Aubameyang leave.
Any move from Chelsea for Aubameyang's signature is likely to see them face tough competition from Newcastle United, who are also interested in signing the Gabon striker.
The 24-year-old striker has a contract till 2018 with Dortmund and is said to have a release clause of about £6m, which has got both the Premier League clubs interested yet again.
Aubameyang scored 13 goals and managed four assists from 32 league appearances for Dortmund during the 2013/14 season.