Liberia has suspended all football activities in an effort to control the spread of the deadly Ebola virus.
There was a risk of infection because football is a contact sport, the football association said.
The number of people killed by the virus in West Africa has now reached 672, the WHO says.
Ebola kills up to 90% of those infected, but patients have a better chance of survival if they receive early treatment.
It spreads through contact with an infected person's bodily fluids.
This is the deadliest outbreak ever, with the first case reported in Guinea in February. It then spread to Liberia and Sierra Leone.