"Today there is the question of do we trust Tsipras and Varoufakis? The answer is clear to all parties, no," the senior German conservative said.
He also lifted the lid on a European Union attempt to push Mr Tsipras's left-wing Syriza out of power regardless of the outcome of the vote on July 5.
If Greece's prime minister and finance minister remained in office, even after a "yes" vote in Sunday's referendum, then Athens would stand no chance of a new bailout, he indicated.
Under the rules of the European Stability Mechanism, the euro's bailout fund, the German parliament, or Bundestag, has a veto or blocking vote over any new programme such as that requested by Greece at the 11th hour.
The senior German conservative said that Angela Merkel's ruling Christian Democrat Union (CDU) and its Bavarian allies the Christian Social Union (CSU) would block any request made while the pair, described as "communists", remained in power.
Comment: The Commies are back! Break open the Cold War rhetoric!
"In my party the CDU/CSU there would be a lot of colleagues who would vote 'no' if Varoufakis and Tsipras are asking. For sure. Because there is simply no trust any more. They say, I am not going to give taxpayers' money to Greece without a reliable partner," he said. Referring to Syriza, he added: "We need a reliable partner who wants to do the job."
Comment: 'Reliable partner' meaning 'compliant yes-men for the democracy-hating, debt-controlling Western world order'.
"We will do everything to get a 'yes'. Then we will need a new government, then we have to implement measures," he said.
Comment: Spoken like a true Western 'democrat'. 'We' decide who rules, not the people.
The politician revealed that the socialist Martin Schulz, the president of the European parliament, was involved in secret talks, possibly including Mr Tsipras — whom he sees as a moderate — to "split the Syriza movement".
Comment: Ah yes, a tried-and-tested measure: divide-and-conquer.
Comment: Governments in the Western order cannot be ruled by normal men: they must be ruled by heartless technocrats that are supplicated by compliant yes-men who can be convinced to betray the wishes of the common people.
In the event of a "no" vote and Syriza continuing to hold the reins of power, the German conservative said, "it's over" and Greece would have to leave the euro after defaulting on ECB loans on July 20. "We will talk about a humanitarian rescue programme but not an additional [bailout]," he said.