Egyptian defender Hany Said has tested positive for the anabolic steroid Nandrolone, and could face a year's suspension from the sport.

Egypt's national team Doctor Ahmed Maged told Egyptian newspaper Al Ahram, that the second sample of a test carried out at the African Cup of Nations in Mali had returned a positive result.

Doctor Maged himself attended the test in Switzerland, as is permitted by the regulations.

The Caf is expected to take a decision concerning this matter in the near future, but the player is expected to be suspended from the game from between six months to one year.

Dr. Maged is reported to feel sorry for the player, as he is certain he didn't take the substance knowingly.

Are tests for Nandrolone conclusive?

Even though a drug test may indicate that the subject has apparently taken nandrolone to boost muscle growth and increase strength, this does not necessarily prove wrongdoing.

It is possible that the body may naturally create a form of nandrolone, particularly if the subject has eaten large quantities of meat contaminated with the substance.

It is also possible that dietary supplements taken perfectly legally by some sports people are broken down by the body to produce the same substances created when nandrolone is broken down.

What are anabolic steroids?

Anabolic steroids are drugs that are usually synthesised from the male reproduction hormone testoterone. They have been banned by many sports because of their danger to health.

Their exact effect on the body is still a matter of scientific debate.

Why do sportsmen take them?

Anabolic steroids can improve the body's capacity to train and compete at the highest level.

They reduce the fatigue associated with training, and the time required to recover after physical exertion.

They also promote the development of muscle tissue in the body, with an associated increase in strength and power.

This is achieved by stimulating the production of protein in the body.