Chelsea could face a battle to keep hold of defender Andreas Christensen as Barcelona are reportedly weighing up a £20m move.
Christensen has yet to make the breakthrough at Chelsea, but he has been a revelation while on loan with German outfit Borussia Monchengladbach and has caught the eye of Barcelona.
The defender spent the whole of last season with Monchengladbach and will also see out this campaign before returning to Stamford Bridge to battle for his place.
Blues boss Antonio Conte is in need of defensive reinforcements as John Terry is coming towards the end of his career, and has made it clear that Christensen's future is with Chelsea.
However their resolve could be tested by Barca boss Luis Enrique, who sees him as a long-term replacement for Gerard Pique, and is ready to make a move.
Christensen could demand assurances over his first-team prospects at Chelsea, and may push for a move to Barca if he does not get them.