Guaido reportedly told Skai he is concerned about Greece's hesitation to condemn Maduro and invited Prime Minister Alexis Tsipras to visit the country to witness first hand the state of its economy.
His bid was swiftly endorsed by Canada, the United States and many Latin American countries.
"Venezuelan soldier, I'm talking to you".
Maduro has accused the United States of promoting a coup against him and promised to stay in office.
On Sunday, Israel and Australia joined the countries backing Guaido, while in Washington President Donald Trump's administration said it had accepted opposition figure Carlos Alfredo Vecchio as the country's diplomatic representative in the US.
Nicolas Maduro's election to a six-year presidential term last year has been widely criticized as a fraud created to keep him and his military allies in power despite the country's years-long spiral into misery and hunger.
Over the weekend, Israeli officials told Channel 13 news that State Department officials had made the request to diplomats at the embassy in Washington DC on Thursday, and that other U.S. allies who have yet to declare their support for either side have also been asked to issue statements in support of Guaido.
Bradley Cooper makes a surprise appearance at Lady Gaga's show
Either way, check out footage from Gaga and Cooper's performance below, courtesy of Garret Gagnon and Gaga Daily . He then joined her on the piano bench and wrapped an arm around her to finish out the final chorus together.
Rubio has expressed support for Guaidó, who declared himself as Venezuela's interim president last week and has been recognized as such by a number of nations that oppose the Maduro regime.
Meanwhile, President Nicolas Maduro insisted Sunday the military is on his side as he watched military exercises using Russian-built rocket-propelled grenades and anti-aircraft machine guns. "Just think logically", Peskov said, addressing reporters.
Maduro stated that they are going to overcome the problem in his country with laws and justice, and added he is "open for dialogue".
Some 29 people have been killed and more than 350 people have been detained in clashes this week between anti-Maduro activists and security forces.
In Washington, Republican Senator Marco Rubio, considered a key architect of the United States policy on Venezuela, played down the possibility of a military intervention despite his and Trump's warnings earlier in the week that "all options are on the table".
In an interview with Turkish private broadcaster CNN Turk, Maduro stressed that his country has no political and diplomatic relations with the US and described Secretary of State Mike Pompeo's remarks at the United Nations Security Council (UNSC) as "the words of a falling country". On Saturday, Venezuela's top military diplomat in Washington, Colonel Jose Luis Silva, defected from Maduro's government. The U.S. imported less than 500,000 barrels a day of Venezuelan crude and petroleum products in 2017, down from more than 1.2 million barrels a day in 2008, according to the Energy Information Administration.
It follows similar declarations by the US, Britain, Germany and France.