The golfing superstar and his wife have kept the pregnancy a secret.
The news was revealed during the television broadcast of the third round of the BMW Championship, where McIlroy is one of the frontrunners.
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The Golf Channel's Steve Sands revealed their baby girl is due "any day now".
McIlroy (31) and Stoll married in a lavish reception at Ashford Castle in Co Mayo in 2017.
It remains to be seen whether McIlroy will miss the Tour Championship (September 4th-7th) or the US Open (September 17th-20th).
