The 22-year-old, who moved to Italy in January after he was recalled from his loan spell at Stoke City, was shown a second yellow card after just 24 minutes for a foul on Il Toro’s Armando Izzo.
But the Norwegian’s dismissal did not stop the Rossoblù from recording their first victory in eight games. Manolo Portanova’s 14th minute strike proved to be the difference between the two teams.
Friday’s win moved Genoa up to 19th in the table, and three points from safety.
Østigård has become a vital cog in a stingy Rossoblù defence. Since his move, the centre half has helped the Genoese keep five Serie A clean sheets in eight appearances.
Check out the latest Premier League speculation below...
1. Saka set for pay hike
Arsenal are reportedly ready to quadruple Bukauo Saka’s salary as they look to tie down the academy graduate to a new deal. (The Sun) | Getty Images
2. Guedes on Wolves radar
Wolves are being linked with a move for Valencia winger Goncalo Guedes. (Estadio Deportivo) | Getty Images
3. Man United target Richarlison
Manchester United now want to sign Everton striker, Richarlison, in the summer transfer window. Arsenal have also been linked. (Goal) | Getty Images
4. MADRID, SPAIN - MARCH 20: Ronald Araujo (L) of FC Barcelona competes for the ball with Vinicius Junior (R) of Real Madrid CF during the LaLiga Santander match between Real Madrid CF and FC Barcelona at Estadio Santiago Bernabeu on March 20, 2022 in Madrid, Spain. (Photo by Gonzalo Arroyo Moreno/Getty Images)
Man United are readying a £33.6million bid to sign Barcelona defender Ronald Araujo. (Nacional) | 2022 Getty Images