Ched Evans, Matt Olosunde, Sean Maguire and Patrick Bauer have all been sidelined in recent weeks.
Frankie McAvoy is hopeful there will be some returns ahead of their Championship fixture against Cardiff City.
The Lilywhites boss told the Lancashire Post: “Pat was back training on Thursday so hopefully he is back in contention for Saturday.
“Pat and Sean will both be in training. Alan Browne is back, he trained on Tuesday and Matt Olosunde played an hour of the game on Tuesday, which is good.
“Ched has been training, we’re gradually bringing him back in, he will be in a full session today.
“That’s pleasing for us as well – we are looking okay on that front, fingers crossed we can get them fully fit as soon as."
Here are the best of today's rumours...
1. Sheffield United have no plans to sell amid Middlesbrough links
Sheffield United boss Slavisa Jokanovic has said he is "not thinking about selling players" in the January window. Middlesbrough have recently been linked with a move for both Chris Basham and Oliver Burke, while Lys Mousset has been targeted by Besiktas. (YorkshireLive) Photo: George Wood
2. Bournemouth, Swansea & Stoke express interest in Rams captain
Bournemouth, Swansea City and Stoke City have all expressed interest in signing Derby County captain Tom Lawrence. The Rams are prepared to offload the star for free as they prepare for life in League One next season. (Daily Echo) Photo: Ashley Allen
3. Hull City expecting January interest for academy product
Hull City are bracing themselves for interest in defender Jacob Greaves this winter. The 21-year-old is under contract at the MKM Stadium until 2023. (The 72) Photo: George Wood
4. Blues defender was "close" to Newcastle United summer switch
Birmingham City defender Kristian Pedersen has admitted he was "close" to a move to Newcastle United in the summer. The 27-year-old said it "would have been a really good opportunity" for him but it didn't work out. (Sport Witness) Photo: Eddie Keogh