"For the good of Guinea-Bissau, losing candidates in Sunday's presidential poll should accept the results and help towards the reconstruction of the country," Chissano told a news conference shortly after he arrived in Guinea-Bissau's capital.
While "all candidates hope to win, they should know that there will be only one winner," he advised
The peaceful running of the electoral campaign did not surprise him.
"This is a good sign for the whole world that Guineans have decided to unite around their country and embark on a way to development," he added.