By Moumine Ngarmbassa and Emmanuel Braun
Herve Morin's visit came as France, which has warplanes and more than 1,000 troops stationed in its former colony, threw its weight behind Deby, who has fought off several bids by rebels to end his 18-year rule in the central African oil producer.
After obtaining U.N. Security Council backing for Deby's government, French President Nicolas Sarkozy said on Tuesday his country could intervene if called upon against the rebels, whom Chad says are backed by neighbour Sudan. Khartoum denies this.
Deby's government says it defeated the force made up of three main rebel groups, which had stormed into the capital on Saturday aboard armed pickup trucks after making a lightning advance from the eastern border with Sudan's Darfur region.
N'Djamena was reported to be calm on Wednesday.
Tens of thousands of N'Djamena residents fled south into Cameroon after the weekend fighting, but hundreds started returning on Wednesday after the Chadian government made TV and radio broadcasts saying it was safe to come back.
