Sjöström went home from the money-loving ISL circus in Naples after two team matches and the intention was that she would train and recover at home after the elbow injury earlier this year.
The comeback would take place only in the playoffs.
But yesterday, the Swedish star announced on Instagram that she has made a quick decision to return to Naples and swim in her team Energy Standards' third match.
- I recently did an X-ray to check my elbow and everything looked perfect.
My plan was to swim the first two matches and then train because I thought it would be too much competition.
But since my elbow feels much better, I started thinking earlier this week that it might be a good idea to come back, says Sjöström according to the swimming site Swimswam.
The competition continues tomorrow
In her first individual start, she met the Australian Emma McKeon, who took Olympic gold in Tokyo in the distance (then in the long distance) before just Sjöström who took an impressive silver despite the injury background.
Now she defeated McKeon in the short course, but still got defeated.
American Abbey Weitzeil surprisingly won the new national record of 23.44, three hundredths ahead of Sjöström.
Emma McKeon finished third at 23.65.
The Australian became historic at the Olympics in Tokyo when she was the first female swimmer to win seven medals, four of which were gold.
It was the first time this ISL season that Sjöström was beaten 50 meters free.
The race was Sjöström's only individual on the first day of the match which continues tomorrow.
MORE SJÖSTRÖM: To the final of the 100 meters freestyle (July 29, 2021)