Venezuela has given the German Ambassador to the country 48 hours to leave, accusing him of meddling in her internal affairs.
Daniel Kriener was among diplomats who helped opposition leader Juan Guaidó to return to Venezuela.
Germany, which recognises Mr Guaidó as interim president, says the decision will only escalate tensions.
Meanwhile, the US says it is revoking the visas of 77 more people linked to President Nicolás Maduro as part of its pressure on Mr Maduro to resign.
They include government officials and their families.
Rallies for and against the government are due to be held on Saturday.