Major General Peter Wall said it was early stages yet and reports were just coming through.
But he suggested UK troops would make sure they'd help if there was a rebellion.
UK forces have been fighting against Iraqi soldiers around Basra for some days now. On Tuesday evening, it was confirmed two British soldiers were killed in a "friendly fire" incident during the fighting.
It's thought the rebellion's might have come from Shia Iraqis in Basra who have started to support coalition forces and fire at Iraqi soldiers.
It's said to have started when Iraqi soldiers tried to stop the civilians from attacking them.
Many Shias are against Saddam Hussein and his Baath Party, who are Sunni Iraqis.