Mr Hoon said: "Bear in mind that we first published our proposals as long ago as January, the second reading was in March.
"Throughout that period there have been conversations asking them [Labour backbenchers] about their concerns.
"With the package of concessions that the government is about to publish, we are addressing them."
The government's former top lawyer, Lord Goldsmith, has repeated his condemnation of the plans.
Writing in the Sunday Telegraph, the ex-attorney general said passing the anti-terror bill would help destroy the "very basis of free society that our ancestors fought so hard to create".
The Labour peer, who was attorney general when Tony Blair made a failed bid to increase the detention limit to 90 days, said: "There can be no mistake that extending the period suspects can be held without charge is a very serious incursion on our fundamental freedoms."
His comments have been criticised by fellow Labour peer Baroness Helena Kennedy QC, who asked why he "sat on his hands" when Mr Blair tried to increase the limit.
Speaking to Andrew Marr, she said: "Isn't it amazing how after office suddenly people discover what their values ought to be?''
The draft bill could see Prime Minister Gordon Brown lose his first Commons vote.
It could be the latest in a long line of embarrassments for the prime minister, who has been criticised over his handling of the 10p tax rate change and changes to car tax.
Labour is also still reeling from heavy defeats in recent local elections and the Crewe and Nantwich by-election.
Mr Straw has once again been forced to defend Gordon Brown, dismissing speculation that he might be replaced as nonsense.
He told the BBC that replacing Mr Brown as Labour leader without a general election would be "unconstitutional".
"Technically it would be unconstitutional, but it's not going to happen," he said.
"He is the best leader we could possibly have and he will see us through these difficulties."
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