Crystal Palace are planning a move for Chelsea attacker Scott Sinclair.
Warnock missed out on taking Sinclair to Selhurst Park earlier this month after the 18-year-old opted for a loan move to the Valley.
But Sinclair has yet to start a game for the Addicks and was not even on the bench at Burnley on Tuesday night, prompting speculation he is poised to return to Stamford Bridge.
Warnock told the Croydon Advertiser: "I will certainly be making a phone call about Scott with regards to his situation."