The defender, 23, was watched by Sven Goran Eriksson's No.2 Tord Grip in the Champions League qualifier against CSKA Sofia on Tuesday night.
And the England bosses have spoken to the Anfield club about selecting Warnock as a surprise deputy for Arsenal's Ashley Cole when the squad is named at the weekend.
Warnock is keeping John Arne Riise out of the Liverpool team at the moment and having the best spell of an unsung career that has also seen him sent out on loan spells at Bradford and Coventry.
Eriksson's spies have been pushing Warnock in the absence of Chelsea's injured Wayne Bridge.
The poverty of options for that role has put him on the verge of a dream call-up for the qualifying matches against Wales and Northern Ireland next month.
Finally svens doing somethig right giving warnock a go
