The 27-year-old Kirby, who played 45 international matches for England, suddenly disappeared from the team after a match against Manchester United in November.
In February, after four months, the club revealed the reason.
She had suffered from pericarditis.
The disease involves fluid accumulating in the pericardium that encloses the heart.
There are good chances of getting well, but it can take quite a long time and you often do not have to make an effort.
Not optimal for an elite football player.
- I hope that the day after this match against Manchester United will not be as dramatic as the day after the last, she says to goal.com.
Positive story
She says she read a lot online about the disease and people affected by the disease.
But that it was only cases that ended badly.
That the disease came back after a while.
- I decided to show myself that I can get through this and be able to tell a positive story unlike all the negatives I read.
Fran Kirby plays with his Chelsea away against Manchester United on Sunday afternoon.
CLIP: Dream start for the Swedes in Chelsea - see the goal here (29 August 2020)
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Magdalena Eriksson celebrates with teammates in Chelsea.
Photo: TT