At positions 0-0, with just under ten minutes left, the 30-year-old was responsible for a huge save up close when the home team's Alberto Cerri steered a post towards goal. Olsen came out and made himself big when the finish took in his stomach.
In the lead, 93 minutes into the game, Giovanni Simeone had to leave the pitch due to a knee injury.
It was Olsen's first zero in Serie A since November 3.