The office of the presidency on Thursday will state where Egypt's new president-elect Mohamed Morsi will take his oath of office, according to Yasser Ali, Morsi's acting spokesman.

In a Wednesday statement, Ali said that the issue of where Morsi would be sworn into office remained the subject of ongoing talks between political forces aimed at reaching a mutually acceptable legal agreement.

Revolutionary forces from across the spectrum have urged Morsi to refrain from taking the oath before Egypt's High Constitutional Court (HCC). They say that to do so would be tantamount to recognising the legitimacy of the judicial institution responsible for the dissolution of the democratically-elected People's Assembly, the lower house of Egypt's parliament.

On 14 June, the HCC ruled that a parliamentary elections law – which regulated last year's legislative polls – was unconstitutional. The following day, Egypt's ruling military council ordered the assembly's dissolution based on the court verdict.

On Tuesday, Egypt's Supreme Administrative Court delayed its ruling in a case challenging the order to nullify parliament's lower house – filed by three members of the dissolved assembly, including parliament speaker Saad El-Katatni – to 9 July.

Article 30 of a 17 June 'constitutional addendum' issued by the ruling military council states that, in the event that parliament is dissolved, Egypt's president-elect should be sworn into office before the HCC's general assembly.

Morsi's Freedom and Justice Party (FJP), along with other revolutionary movements, has vociferously rejected the constitutional addendum, which transfers several key powers – including the authority to declare war – from the office of the presidency to the ruling military junta.

Ali went on to deny recent reports that Morsi had met on Tuesday with prominent reform campaigner Mohamed ElBaradei, or that the FJP had agreed to a deal in which it would only take 30 per cent of the seats in Egypt's incoming cabinet.