The club tweeted: "Change to the squad. Messi is out for personal reasons and Yerry Mina takes his place."
Messi's wife Antonella Roccuzzo is expecting a boy, a brother to five-year-old Thiago and Mateo, who is two. The child is expected to be called Ciro.
The Argentinian couple, both 30, first met as children in 1996. Their relationship began a decade later.
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