The Spanish club are said to be keen on the centre half after his impressive performances both domestically and in the Champion’s League and now the Express have reported that they are ready to make a £6million bid for the player, who signed from FC Groningen for just £2.2million last summer. New Celtic manager Ronny Deila has already stated that he wants to keep all of his top players and was hoping to keep Van Dijk for at least another season.