Assistant boss Pep Lijnders has indicated the Portugal midfielder’s time with the club is nearing an end.
Horner, 52, is exploring a way back to the paddock after he was sacked as Red Bull team principal following last July’s British Grand Prix.
McIlroy is not in his best form and will face a strong challenge from a number of the world’s best.
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Despite being England’s only frontline spinner in Australia, Bashir was overlooked during last winter’s 4-1 defeat.
Cork winner Funiculi Funicula serves as something of a relief following day of beaten favourites.