The Lilywhites lost 2-0 to a youthful Manchester City side on Tuesday night, with two more friendlies to come this week - at Wigan on Friday night and against Manchester United at Deepdale on Saturday.
They currently have Jamie Thomas on trial, the Bamber Bridge attacking midfielder attempting to get back into the full-time game and earn himself a deal.
He was an unused sub at City but could get a game in the Wigan friendly.
There is still plenty of business to be done in the Championship both before the season kicks-off on August 7 and ahead of the transfer deadline on August 31.
Here is the latest transfer news and rumours from the Championship.
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1. Swansea eye new manager
MK Dons boss Russell Martin is he favourite to fill the managerial vacancy at Swansea (Various) Photo: Press Association
2. Derby defender chased by local rivals
Derby defender Lee Buchanan is wanted by Nottingham Forest - they have had two bids turned down for him. (Sun) Photo: Camerasport
3. Swansea midfielder attracting attention
Swansea midfielder Matt Grimes is being eyed by Watford and Brighton, following earlier interest from Fulham. (Football Insider) Photo: Bruce Rollinson
4. Blackburn closing in on Reach deal
Blackburn are hoping to make former Sheffield Wednesday midfielder Adam Reach their first signing of the summer. (Blackburn Telegraph) Photo: Press Association