US astronaut Michael Fincke and Russian cosmonaut Gennady Padalka will attempt the mission at 2140 GMT, a spokesman for TsUP mission control told AFP.

Fincke and Padalka had briefly stepped out of the orbiting station on Friday but came back after a few minutes because of a defect in Fincke's space suit.

Fincke and Padalka were scheduled to repair one of four gyroscopes controlling the station's orientation as it orbits Earth, replacing a circuit breaker that failed and cut power from the gyroscope.

The space walk was originally scheduled for June 16, but it was delayed to avoid possible communication problems resulting from the launch of a satellite from Russia.

SPACE.WIRE