Supporters of former Ukrainian Premier Yulia Tymoshenko hold portraits of their jailed leader.
"Doctor [Lutz] Harms left in a rush. We asked him, but he said he did not know [when he would return]," Afanasyev told journalists on Thursday, July 12.
He added that the ex-premier's treatment schedule, which Harms drew up before his departure, had no deadlines.
The chief of the clinic confirmed that Tymoshenko was still refusing to take a blood test.
"One sample could be sent to the Charite Clinic, another one to a Ukrainian laboratory, and one more sample could be saved to settle expert questions, but she and her lawyer have refused to permit such a procedure," Afanasyev said.