Crystal Palace have compiled extensive scouting reports on Leeds United and Celtic defenders Charlie Taylor and Kieran Tierney, according to the Guardian.
Palace have been without regular left-back Pape Souare since September, and the 26-year-old admitted this week that he does not know if he will return to the game after breaking his hip and jaw in a car accident.
The Eagles are likely to face stiff competition should they pursue a deal for Taylor, with several other clubs said to be keen on the 23-year-old, whose Leeds contract expires at the end of the campaign.
Tierney, however, signed a new five-year deal at Celtic in the summer and could be more difficult to prise away.
The report also claims that Palace have maintained an interest in Paul Dummett, who played under Alan Pardew at Newcastle United, with the Eagles boss said to be overseeing the club's January transfer plans despite his job being under threat.
Taylor, who rejected a new Leeds deal in the summer, does not appear to be affected by the ongoing speculation and has remained a regular in Garry Monk's promotion-chasing side.
A move for the Yorkshireman could be advantageous, with Tierney not expected to return from injury until the New Year at the earliest.
The 19-year-old, who is a product of the Bhoys' academy, has already made 54 appearances for the Celtic Park side and won two caps for Scotland.