The newly-promoted club said in a statement on Friday they had reached an amicable agreement to cancel Stoican's contract, adding that Radulescu took over on a temporary basis.
Last month, Stoican, the Romanian league's seventh coaching casualty, replaced Bogdan Vintila but the move did nothing to change Voluntari's flagging fortunes after a disappointing start to the season, which began in July.
Voluntari are second from bottom in the 14-team Romanian championship after failing to record a win in their 11 league matches so far.
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(Reporting by Angel Krasimirov; editing by Sudipto Ganguly)
