Blues will have to break bank to sign Bundesliga star...
The 21-year-old is piquing the interest of the west London giants, according to The Daily Mail, who also indicate that AC Milan and Manchester United are interested in the Serb.
But the player's agent, Stephen Kelly, insists that his client is happy at Dortmund and will only move if his suitors are prepared to dig deep into their pockets.
"It will take a hell of a lot of money to get Neven," said Kelly.
"He's happy with his new four-year contract. It's a bloody good one, too."