Two more players set to reach cap milestones, Angharad James and Rhiannon Roberts, are also included.
Tottenham midfielder James will reach 100 caps if she plays in both qualifiers, while Roberts will reach 50 caps if she plays twice.
Wales will be backed by a record crowd against Slovenia, with the Football Association of Wales (FAW) saying there has been a “surge in ticket sales on the back of a record-breaking Euro 2022 tournament”.
Around 9,000 tickets have been sold, with the FAW hoping the Slovenia match will be watched by Wales women’s first five-figure crowd.
“To play in front of so many people is really special. It is an important time for us to capitalise on the growth of the game,” Grainger added.
“We are excited to play against Slovenia and we think a big crowd will get us a big competitive advantage.
“The success of the Euros has given us a bigger stage to show what we are doing.
“The Euros gave the game more visibility. Hopefully that leads to more investment and higher accessibility.”
Wales squad: Laura O’Sullivan, Olivia Clark, Safia Middleton-Patel, Rhiannon Roberts, Josie Green, Hayley Ladd, Gemma Evans, Rachel Rowe, Lily Woodham, Sophie Ingle, Anna Filbey, Angharad James, Georgia Walters, Charlie Estcourt, Jess Fishlock, Carrie Jones, Ffion Morgan, Megan Wynne, Elise Hughes, Kayleigh Green, Helen Ward, Natasha Harding, Ceri Holland, Maria Francis-Jones, Chloe Williams, Morgan Rogers.