Celtic are missing several players due to injury as they prepare for the visit against table-topping Inverness Caledonian Thistle.
Meanwhile James Forrest is to see a neurologist in an effort to overcome a sciatica problem.
Youngster Tony Watt will lead the line for the injury-ridden champions at Celtic Park.
Mckay's exploits have led to the striker being called up by Northern Ireland for their forthcoming World Cup qualifiers.
Celtic: Forster; Matthews, Ambrose, Van Dijk, Izaguirre; Brown, Kayal, Rogic, Mulgrew; Amido, Watt
Inverness CT: Brill, Raven, Warren, Meekings, Shinnie, Foran, Draper, Doran, Vincent, Ross, Mckay