Gianni Infantino was among the crowd after travelling from the International Football Association Board meeting in Cardiff but the FIFA president saw a contest low on quality.
Swansea striker Alberto Paloschi’s miskick soon set the tone although Nathan Redmond warmed Lukas Fabianski’s hands at the other end with a shot from an acute angle.
Canaries duo Cameron Jerome and Robbie Brady both picked up yellow cards and the latter soon limped off, although his pain would have been greater if Andre Ayew had headed in from Angel Rangel’s cross after the Irishman had carelessly lost possession.
Swansea full-back Neil Taylor became the third player booked in a frantic opening before Norwich managed an attempt on target in the final minute of the half when Steven Naismith laid the ball off to Jerome and Fabianski pushed his 20-yard effort to safety.
Ayew then tumbled under Timm Klose’s challenge inside the area but ref Craig Pawson correctly ruled that the Ghanaian was looking for the foul and contact was minimal.
Paloschi was taken off at half-time with Curtis pushing Ayew up front and Modou Barrow introduced on the right.
The switch had the desired effect as Swansea started to enjoy greater possession and territory and Norwich’s growing anxiety resulted in bookings for Ryan Bennett, Russell Martin and Redmond.
Barrow and Ayew both fired over before Swansea finally found the bit of quality they had been looking for.
Jack Cork freed Fer down the right and the Dutchman’s slide-rule pass allowed the unmarked Sigurdsson to pick out the bottom corner from 14 yards.