Cagliari boss Zdenek Zeman has left his post at the Serie A strugglers for the second time this season.
Zeman, 67, took over in the summer but was sacked just before Christmas with former West Ham and Watford boss Gianfranco Zola replacing him.
Ten league games later Zola was sacked, with Zeman returning to the club.
But the Czech-born Italian has now resigned, with the club nine points from safety, after picking up one point from his five games in charge.
A brief statement on Cagliari's website confirmed Zeman's resignation but made no mention of a caretaker boss or timeline to replace him.