On Thursday, the Russian space agency said it had received some telemetry data and engineers were working on the information, the Interfax news agency said.
"Our Russian colleagues provided a full set of telecommands for us to send up and Perth station was set to use the same techniques and configurations that worked earlier," said ESA's Wolfgang Hell, in charge of liaising with Russia over Phobos-Grunt.
"But we observed no downlink radio signal from the spacecraft."
Phobos-Grunt is Russia's first interplanetary mission since 1996, when an attempt to send an instrument-laden 6.1-tonne probe to the Red Planet, Mars 96, ended with a failure just after launch.
The five-billion-ruble ($165-million) scout is designed to travel to the Martian moon of Phobos, scoop up soil and return the sample to Earth by 2014.
But mission control lost radio contact with the 13.5-tonne craft hours after launch, leaving engineers baffled as to where it was.
ESA added, though, that observations from the ground indicated that Phobos-Grunt's orbit had become more stable, which was encouraging.