The Spanish defender may shun the limelight but he remains an integral cog in a Stamford Bridge machine chugging towards the Premier League title
COMMENT
For every action there is a reaction and for every cause there is an effect.
In footballing terms, this philosophy of yin and yang means that every creative influence and fox-in-the-box striker must be countered by dogged and no-nonsense team-mates.
Star turns are all well and good, but they will only shine at their brightest if supported by a cast happy to operate in the shadow of more illustrious colleagues.