Italy says critical of Vivendi moves on Mediaset but may not intervene

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French media giant Vivendi, which is Telecom Italia's (TLIT.MI) main shareholder, has rapidly built up its stake in Mediaset (MS.MI) from 3 percent to more than 25 percent, triggering complaints from Mediaset's management and Italian government officials.

"Our judgment remains basically negative but this doesn't mean we will take any ad hoc measures," Industry Minister Carlo Calenda told reporters in Rome, adding that Vivendi's behavior appeared to be "a bit too opaque."

(Reporting by Massimiliano Di Giorgio, writing by Gavin Jones)