if you arent good defending, i suggest you trying with the "holly trinity" of Colombian defenders...
Luis amaranto perea (Atl. madrid)
Ivan Ramiro Cordoba (Inter Milan)
Mario Alberto Yepes (Paris Saint Germain)
these guys are so good that some times you will think they are playing by their own...
yepes is a classic style CB, strong, tall, responsible, even agile, mid-fast, and excellent for tackling cleanly...say good bye to fouls near your area...
perea and cordoba, oohhh...i can describe them with just a few words: THEY ARE THE FASTEST DEFENDERS IN THE WHOLE DAMN GAME!, in fact, they are faster than many great strikers like sheva, messi, saviola, ronaldo etc. They are not only a couple of bullets, but great anticipating the strikers passes, and very, very, very strong on man on man situations...
you can complete a 4 players defense with rio ferdinand, chivu, or another good and fast defender you prefer.
i really recommend using these players cuz its very very easy to make them work...even if youre a bad defender...
que viva Colombia Carajo!
i hope this could help somebody