Stewart suffered the injury while playing for Russian club Dynamo Kursk on Sunday in the EuroLeague Women championship game in Hungary. She appeared to land awkwardly on the foot of fellow WNBA star Brittney Griner after attempting a jumper late in the first half against UMMC Ekaterinburg. She immediately grabbed her lower right leg while grimacing in pain.
Stewart was attended to by trainers on the court before being helped to the locker room. The 24-year-old Stewart won four national titles at UConn and was the No. 1 overall pick in the 2016 WNBA draft. She won both the league and finals MVP awards while leading the Storm to the franchise's third WNBA title last season.
Stewart has played overseas in the offseason since she joined the WNBA.