McKay called up by Northern Ireland
Although born in Corby, McKay was capped twice by Northern Ireland Under-21s in 2009-10 and now has the chance to make his senior international debut at Windsor Park on Wednesday.
Although O'Neill has a handful of wingers in his panel, the withdrawal of Ward and the ongoing unavailability of Burnley's Martin Paterson left the former Shamrock Rovers boss somewhat short of in-form cover in the centre-forward position.
But, with six goals to his name in 15 appearances this season, McKay has one more goal to his name this season than the latter pair combined.
Northern Ireland got their Group F campaign back on track last month with a 1-1 draw against Portugal in Porto and will be looking for their first win under O'Neill.