Preston duo Michael Tonge and Danny Pugh will play the final game of their initial 30-day loans against Watford at Vicarage Road.
But a deal has been struck to keep the Stoke pair for another month, although there is a 24-hour recall clause should they be needed back at the Britannia Stadium.
Iain Hume's 93-day stay from Barnsley has expired, but he is expected to return to Deepdale in a permanent transfer when the transfer window opens in January.
On-loan Manchester United striker Josh King has recovered from an ankle injury and could start up front against the Hornets.
Ferguson: "Having Josh back is good, he gives us pace and strength. Josh has worked really hard with his fitness, he's looking leaner and I'm looking forward to working with him again."