Elanga, who has had a good start to the season in England, was not in the Premier League team's squad for the match against Leeds.
A moment later, it became clear that the 24-year-old was injured.
This makes him a doubt ahead of Sweden's squad selection for the Nations League matches against Romania on September 25 and Poland three days later.
Both matches will be played at Strawberry Arena in Solna. After that, two away matches await - Bosnia-Herzegovina on October 2 and Romania on October 5.
National team coach Graham Potter will name the squad on Wednesday.
