Speaking to Sophy Ridge on Sunday, Liberal Democrat leader in the Lords, Lord Newby, said moves would be made to include changes which were slapped down in the Commons on Wednesday.
However, he denied the Lords were trying to thwart Brexit as he branded it "Aunt Sally" to claim that amending something was the same as trying to block it.
Lord Newby told the Sky News host: “No one is talking about the House of Lords blocking it.
“What the House of Lords will do is fulfil its constitutional duty of subjecting the bill to scrutiny, putting forward amendments and discussing them… sending it back amended for the Commons to think again.”
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Lord Newby admitted the Upper Chamber would push for amendments to the Brexit Bill
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Having none of it, former Conservative chancellor Lord Lamont said he feared some were tabling amendments in order to "scupper" the Government's negotiations.
He thundered: ”I think a lot of the amendments that are put forward are really designed to obstruct the bill and everybody knows that if the bill is delayed that will scupper the whole negotiation.
"I'm not saying that's Lord Newby's motive but I think it's the motive of some of the people coming forward with these amendments – it's to get embroiled in a time wasting, time delaying exercise."
Continuing the rant against bitter Remainers who refuse to accept the will of the British people, the Lord said any perceived blocking by the Upper House would cause "outrage" and could prompt calls for reform.
Passing these amendments does not delay the process for a second
He added his party want to include a second public vote on the final Brexit deal and also a guarantee for EU nationals living in the UK.
"If you take the amendments we are going to be pressing they don't have that effect at all,” Lord Newby told Ridge.
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"Passing these amendments does not delay the process for a second."
It comes as the leader of the Commons insisted ministers are not waiting in "back alleys" to "cosh" peers if the House of Lords moves to amend the Brexit bill.
REMOANERS: These people hate BREXIT! Mon, January 16, 2017
Remainers are finding it hard to accept Brexit.
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Speaking to BBC's Andrew Marr Show, David Lidington said he was not issuing threats to the upper House as he said peers needed to listen to the strength of feeling in the elected wing of Parliament.
"I am not standing, sort of, around the back alley, you know, waiting for a stray peer to arrive having a cosh in my hand,” Mr Lidington said.
"Of course they are free to propose and debate amendments, I hope they will also take full account of the strength of opinion from the elected House.
"We have got a constitutional process, and I think the fact the exit bill has gone to the House of Lords – Article 50 bill – with a majority of more than 300 from the Commons, and unamended, and frankly, the amendments were all defeated by majorities well in excess of the Government's normal majority, is a pretty powerful message to the Lords."
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