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MARK WARBURTON is set to make his third signing of the January transfer window by snapping up Hearts winger Billy King on loan for the rest of the season.

Rangers have been pursuing St Johnstone forward Michael O'Halloran and missed out on Toumani Diagouraga but have now swooped for the 21-year-old Jambos star.

Gers have already landed winger Harry Forrester from Doncaster for an undisclosed fee, as well as former Lech Poznan keeper Maciej Gostomski - and the imminent capture of King may spell the end of their interest in fellow winger O'Halloran.

However it is understood there is no option to buy involved in the deal.

King has featured regularly for Robbie Neilson's side this campaign having made 20 appearances, scoring two goals in the process.

King has played in nearly 100 games for Hearts since 2012 and has represented Scotland at U15, U16, U19 and U21 level.

King is expected at Auchenhowie today for a medical to finalise the switch and if the deal is completed in time, King will be available for selection in the Gers' clash with Falkirk at Ibrox on Saturday.

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WATCH as Keith Jackson discusses the transfer window with the Record FC bloggers in the Great Pub Debate: