Doncaster Rovers have bolstered their defensive options with the signings of Byron Webster and Mustapha Dumbuya.
Doncaster wasted little time after selling Matt Mills to Reading by snapping up both Webster and Dumbuya.
Webster has signed a two-year deal joining from Czech side SIAD Most, following an impressive trial spell.
Rovers have also announced the signing of Dumbuya on an initial one-year deal.
The 21-year-old defender, who was previously with Grays Athletic, put pen-to-paper after impressing O'Driscoll during a pre-season trial.