Pierre-Emerick Aubameyang is on Chelsea's list of striker targets this summer

Chelsea want to sign Borussia Dortmund striker Pierre-Emerick Aubameyang after missing out on Romelu Lukaku, according to Sky sources.

The Blues are intent on signing a world-class striker this summer, with Diego Costa also set to leave Stamford Bridge.

Chelsea manager Antonio Conte likes Aubameyang and the 28-year-old is on his shortlist with Alvaro Morata of Real Madrid, Torino's Andrea Belotti and another current Premier League striker.

Antonio Conte has told Diego Costa he can leave Chelsea this summer

Dortmund will let Aubameyang go this summer for about £70m and he has told the club he wants to leave, with both AC Milan and Paris Saint-Germain already holding talks to sign him, and a move to Tianjin Quanjian collapsed last week.

Dortmund chief executive Hans-Joachim Watzke says they have not received any offers yet and warned interested clubs that they are running out of time.

"We will wait a few more days but not long anymore," he said. "I would personally prefer if he stays, but there are a few clubs on this planet where he can obviously earn more."

Chelsea also remain keen on Real Madrid striker Alvaro Morata this summer

Dortmund want Aubameyang's future to be sorted out by July 24 when they leave for a training camp in Switzerland.

Aubameyang was the top-scorer in the Bundesliga last season with 31 goals in 32 games. He scored 40 times in all competitions.