Other countries including France and the US have pledged to send aid. The Red Cross has launched an emergency appeal for $6.9m (£5.6m) and Unicef said it needed at least $5m to meet the immediate needs of 500,000 affected children.
Meanwhile, at least 21 have been killed by Matthew in the US, 10 of them in North Carolina, most of them swept away by flood waters.
"Hurricane Matthew is off the map. But it is still with us. And it is still deadly," Governor Pat McCrory said.
There were also four deaths in Florida and three each in Georgia and South Carolina. One death was reported in Virginia. Nearly 1.2 million people were without power.