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.
Oldham have further bolstered their squad with the capture of Lee Barnard on loan from Southampton until the end of the season.
Barnard was previously on loan at League One side Bournemouth, where he scored four times in 15 games earlier this season.
The 28-year-old is Oldham's third capture of transfer deadline day, following Reading's teenage midfield player Jordan Obita and veteran striker Chris Iwelumo into the club.
The signings come as Paul Dickov bids to guide the 19th placed Latics away from the danger, sitting just one point above the relegation zone.