"I haven't seen him", the therapist and cardiologist, who says he has been treating the Russian Kremlin critic since 2013, answered.
His lawyer, Vadim Kobzev, tweeted that Navalny so far has received only one glucose injection since Sunday at the hospital unit, which is meant to treat tuberculosis patients.
Meanwhile, Russian Security Council Secretary Nikolai Patrushev and US National Security Advisor Jake Sullivan discussed possible directions in the development of the US-Russia cooperation and the progress of preparation for a high-level meeting during a phone conversation on Monday, the Russian Security Council said. The Kremlin said Putin would take part in a separate online climate summit that Biden is hosting on Thursday.
Navalny's lawyer Alexei Liptser said after visiting him in the hospital of penal colony No. 3 in the city of Vladimir, east of Moscow, that his health was deteriorating and he had again been denied access to his own doctors.
According to reports from people close to him, an examination found elevated levels of potassium.
Liptser said Navalny looked weak and thinner. His current symptoms "could be life-threatening", which is why Navalny should be transferred to an emergency room.
In a post on his Instagram account, Navalny described a grueling search that lasted for several hours before his transfer and wryly described his condition. The imprisoned opposition politician was examined in a hospital, including undergoing an MRI scan, and was found to have herniated discs, the law enforcement agency told Russian media.
A team of medics has been attempting to see the 44-year-old since early this month, after President Vladimir Putin's most outspoken opponent launched a hunger strike on March 31 demanding proper medical treatment for a litany of ailments.
Republicans blast Rep. Maxine Waters over protest comments
Waters' remarks caused outrage among prominent Republicans, many of whom have already called for her' impeachment. The attorney said he didn't know how the jury could be "free from the taint of this".
On Thursday, the Biden administration announced sanctions on Russian Federation for interfering in the 2020 USA presidential election and for involvement in the SolarWind hack of federal agencies - activities Moscow has denied.
European Union foreign policy chief Josep Borrell already assailed the Kremlin for its arrest and treatment of Navalny on Sunday and insisted he should have access to doctors he trusts.
"The health of convicts in the Russia Federation can not and should not be a topic concerning them", said Mr. Putin's spokesman Dmitry Peskov. "They can use me to scare children who refuse to eat: 'If you don't eat porridge, you will be like that man with big ears, shaven head and hollow eyes'". The Navalny associate accused the Russian president of allowing Navalny to die "live".
On Sunday, Navalny's team said a nationwide protest was planned for Wednesday to highlight his plight.
Despite his worsening condition, Navalny still showed his sardonic humor.
Washington and Moscow have recently expelled 10 of each other's diplomats in tit-for-tat moves. Legal proceedings on the matter are classified as secret. Zhdanov says it is a coincidence, but is pleased about the additional pressure on the president.
"Now is the time for the United States to demonstrate good sense and to turn its back on a confrontational course", Lavrov said in a statement.
And Russia's anti-monopoly regulator said Monday it was investigating YouTube for making "biased" decisions about comment moderation on the platform often used by Navalny for calls to protest.