When submitting the lineup, Team Manager Outi Saarinen mistakenly entered former player Stina Ruuskanen instead of 23-year-old Djurgarden defender Nanne Ruuskanen.
The error was not discovered until after the deadline.
Ruuskanen, who received her call-up 29 years after playing two senior internationals for Finland, took the mix-up in good humour.
"I'm definitely ready if the call comes! Just yesterday I was playing in a hobby league match... so my game feel is good," she told the Finnish newspaper Ilta-Sanomat.
The younger Ruuskanen, who is no relation, was unable to take part in the Nations League match, a 1-1 draw in Helsinki on Tuesday.
"Nanne was, of course, disappointed but took the news very well considering the circumstances," Saarinen said in a statement from the Finnish Football Association.
"I am very sorry for the mistake."