UPDATE 1-Madagascar head seeks to ban ex-leaders from poll

* Rajoelina says one former head of state disagrees

* France urges Rajoelina to say he won't run

(Recasts, updates throughout, previously PARIS)

By Alain Iloniaina

ANTANANARIVO, May 13 (Reuters) - Madagascar's army-backed President Andry Rajoelina said on Wednesday he was negotiating a pact with political groups to ban former leaders from running in the island nation's next presidential election.

Regional blocs and foreign powers have denounced Rajoelina's rise to power as a coup d'etat, and several donors suspended aid after the youthful former DJ seized power from Marc Ravalomanana in March with the support of the military.

"At this moment, we are looking to sign an agreement ... In this agreement ... those who have exercised the role of head of state before cannot stand. But this agreement is not accepted by all," Rajoelina told reporters.

"There is one head of state who does not accept. I cannot decide alone so I await the reply of the other heads of state."

Rajoelina said four political groups, which he did not name, were thrashing out the deal. Several diplomats in Antananarivo said Rajoelina had told foreign envoys on Tuesday that he would not stand. But a senior aide later denied that.