Transfer speculation continues to mount as Castello Lukeba has been linked in recent days with a move to Barcelona. The defender, currently playing for Leipzig, could add a new dimension to the squad if the rumoured interest turns into an official approach before the end of the transfer window. Arsenal, Bayern Munich and Aston Villa remain in the background, but for now, Barcelona are leading the way in ongoing talks. With only 7 goals conceded in 7 (1.0 per game), Barcelona have been one of the stronger defences in the LaLiga this season.. Castello Lukeba would be asked to keep that standard and provide dependable cover when needed. Reports suggest Barcelona are monitoring Arthur Dias, JJ Gabriel and Estevao whereas Leipzig have not been associated with other players at this stage. Stay tuned for more details as the story develops. Need more Barcelona transfer rumours? Follow @PlayerSwitchCom on Twitter for news and updates as they happen.