Gary Locke is working to bring in a free agent, or else face pitching in Ryan Millar for his debut.

SNS Group

Kilmarnock are racing against time to try and sign an emergency goalkeeper in time for Wednesday's League Cup tie with Hearts.

Injury to first choice Jamie MacDonald could leave manager Gary Locke without a senior keeper for the clash.

The player having underwent a scan on Monday morning on an ankle injury sustained in the weekend win over St Johnstone.

With his weekend replacement Conor Brennan cup-tied, and loan signing Oliver Davies also on the sidelines, STV understands the Killie boss is working to try and bring in a free agent at the last minute for the cup match.

Should both options fail, 16-year-old Ryan Millar would be pitched in for his professional debut.

The youth player has been on the bench for the club's development squad in recent matches.

The Rugby Park side also remain hopeful MacDonald could yet make the game,

Kilmarnock are also unable to recall Devlin Mackay from Derby County.

The 18-year-old's loan is treated as a transfer because it is cross-border, meaning he can not return to Scotland until the January window.

Killie are limited to signing free agents, with clubs in the Premiership unable to make emergency loan signings from other Scottish sides without receiving permission from the SPFL board.