As reported earlier, Lutsenko had been placed in intensive care after suffering "closed-head injury, concussion and hematomas".
Violence broke out between protesters and riot police on Friday when a court jailed three ultra-nationalists were handed six-year prison sentences for allegedly plotting to blow up a statue of the revolutionary Soviet leader Vladimir Lenin in 2011.
The unrest took place amid ongoing protests at Ukraine's decision to pull out of a landmark deal with the EU.
Lutsenko, the leading opposition figure was a prominent member of jailed former PM Yulia Tymoshenko's pro-Western government.
He himself was jailed for embezzlement and abuse of office in 2010, but pardoned under EU pressure in April 2013.
QHALutsenko , beaten , Kyiv , protests