Relegation-threatened Livorno have sacked Domenico Di Carlo after just 88 days in charge and re-appointed Davide Nicola.
Virgil van Dijk claims he knows nothing of interest from English clubs and is keen to prove himself in the Champions League with Celtic.
Sunderland midfielder Cristian Riveros has completed a permanent move to Turkish club Kayserispor for an undisclosed fee.
The 29-year-old Paraguay international has spent the last season on loan in Turkey after failing to make an impact at the Stadium of Light, and has now severed his ties with the Black Cats.
Riveros, who was signed from Mexican outfit Cruz Azul by former boss Steve Bruce in May 2010, made just 14 appearances for the club.