Leaders at the mosque in Finsbury Park, a neighbourhood in northwest London, abandoned plans to open up the building when confronted by scores of Hamza followers praying in front of it on Friday.
On 6 August several hundred supporters disrupted the official reopening of the mosque, closed last year after an anti-terrorist raid.
Egyptian-born Hamza, 46, is facing extradition to the United States on 11 "terrorism"-related charges, notably regarding a hostage-taking in Yemen in 1998 and an alleged al-Qaida training camp operating in Oregon in 1999-2000. His hearing was adjourned in July until mid-October.
The mosque was shut down early last year in what was seen as a British Government response to Abu Hamza's outspoken sermons. Unfazed, the hook-handed radical cleric continued to preach on the sidewalk outside the premises.
Apart from the extradition proceedings, Abu Hamza - currently held at a prison in southeast London - is challenging an attempt by London to withdraw the British citizenship he acquired through marriage in the early 1990s.
His Egyptian citizenship was revoked in May this year.