Iceland winger Johann Berg Gudmundsson’s World Cup adventure is in doubt after it was confirmed he has torn a calf muscle.

The 27-year-old Burnley midfielder was injured during Saturday’s 1-1 Group D draw with Argentina and is being monitored by medical staff ahead of Friday’s showdown with Nigeria.

Iceland assistant coach Helgi Koldvidsson told a press conference: “Johann Berg Gudmundsson has torn a muscle. It remains a question whether he will be fit, but we’ll see on match-day.”

Gudmundsson and his team-mates are due to complete their group fixtures against Croatia on June 26, with the last-16 fixtures for the top two teams in their pool scheduled for June 30 and July 1.