Mon Jul 8, 2013 9:47am EDT
* Athens needs 8 bln euros but payment set to be drawn out
* EU/IMF lenders say "outlook remains uncertain" for Greece
* Last week's Portuguese upheaval sets uncomfortable backdrop
By Robin Emmott and Annika Breidthardt
BRUSSELS, July 8 (Reuters) - With fresh promises from Greece to redouble its reform efforts to keep international financial aid flowing, ...