Chelsea have been rocked by the news that David Luiz wants to quit Stamford Bridge for Barcelona this month, according to Spanish newspaper Mundo Deportivo.
The 26-year-old, who has become one of the Blues' most versatile and important players since arriving at the club from Benfica in 2011, is believed to have had his head turned after Barcelona made a £34.5m bid for his services last week.
The La Liga champions are desperate to sign a new centre-back to bolster their vulnerable defence - and, in particular, a player that is confident on the ball with the ability to play from the back.
Luiz, one of the most technically-gifted defensive players in the Premier League, fits the bill perfectly - hence Barcelona's pursuit of the player.
However, Chelsea are determined to keep the Brazil international at Stamford Bridge, with manager Jose Mourinho recently stating that Barcelona were "wasting their time" by making an official bid.
Nevertheless, if Mundo Deportivo's reports are true and Luiz does want to join Barcelona, this will leave Mourinho with a major problem ahead of the start of the new Premier League campaign.
The Blues take on Hull City this weekend, before travelling to Old Trafford to face the reigning English champions Manchester United.
But will Luiz still be with them?