Portugal is to implement emergency measures to comply with the eurozone's growth and stability pact and overcome a "deep crisis" after the European Commission ruled that a planned €1bn property deal could not be considered as extraordinary government revenue.

Pedro Santana Lopes, the outgoing prime minister, said on Tuesday he would announce special measures this week aimed at raising the €750m ($1bn, £516m) needed by December 31 to prevent Portugal from breaching the pact's budget deficit rules.