LONDON - Portuguese Prime Minister Pedro Passos Coelho said on Wednesday there were "no guarantees" that the country would meet its commitment to return to the international capital markets before September 2013.

Passos Coelho said in an op-ed in the Financial Times that he was optimistic Portugal would fulfil its obligations, but called for realism and pragmatism as factors outside the government's control could play a role.

"It is important to say something that will sound controversial, but is in fact not controversial at all - in an age of uncertainty there are no guarantees," he said.

Passos Coelho described Portugal's commitment to deliver on the terms and conditions of its bailout as unwavering, and dismissed suggestions of a second bailout or debt restructuring if the government's reform plan runs smoothly.

"I am confident about the reform plan we have in place and our ability to return to the markets on time if we deliver it," he said.

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