UPDATED 1.46PM: Andrew Greste says he's had no confirmation of reports his journalist brother Peter Greste will be released from jail in Egypt and deported.

Andrew Greste has tweeted that he has no official confirmation of his brother's release and that at this stage the reports are rumours.

Australian media have widely reported unconfirmed reports from Egypt that a presidential decree has been issued clearing the way for the Australian journalist to return home.

Monday will mark 400 days since the al-Jazeera reporter's arrest and imprisonment, along with two colleagues.