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.
Sky Bet Championship side Bolton announced on Monday they had signed the 22-year-old on a deal until January.
But Cardiff boss Malky Mackay then decided Mason should stay with the Barclays Premier League club and informed Wanderers counterpart Dougie Freedman later that evening.
A statement on Bolton's official website on Tuesday afternoon read: "Joe Mason will remain with Cardiff City following talks between Dougie Freedman and Cardiff boss Malky Mackay yesterday (Monday) evening.
"It was at the Cardiff manager's request that the striker remained in South Wales."