The full-back came to Linköping before the season and has been a contributing factor to the club's position in the women's league.
But she had no idea that she would take a place in Peter Gerhardsson's squad.
- I was lying on the sofa and all of a sudden my phone flooded, I didn't even follow the selection, says Lennartsson.
In addition to Stina Lennartsson, Roma goalkeeper Emma Lind makes her A national team debut.
Lennartsson replaces Jennifer Falk, who is forced to withdraw as she is expecting a child.
In addition, Julia Zigiotti Olme and Sofia Jakobsson are back in the national team squad.
Sweden faces Spain on 7 October and four days later they are visited by France at Gamla Ullevi in Gothenburg.