Naylor is from Mississauga, Ontario, about an hour away from Toronto. He was promoted by San Diego on Friday and was set to bat sixth as the designated hitter.
He is one of two Canadian youngsters playing for the Padres this weekend. Right-hander Cal Quantrill, the son of former big league pitcher Paul Quantrill, is set to start Saturday.
Naylor was the 12th overall pick in the 2015 draft by Miami, the earliest a Canadian-born position player has been selected. San Diego acquired him a year later in a deal that sent back Andrew Cashner.
Naylor is hitting .299 with 10 homers in 45 games with Triple-A El Paso this season.