The Finn admitted at Spa that there have been "a couple of races" this year when his left leg begins to lose feeling.
"It's difficult to say how much I am affected, but it can lead to mistakes," said Bottas, who is 50 points behind his teammate Lewis Hamilton in the drivers' championship.
He told Speed Week at Monza: "The team is in the process of finding a solution. They listen carefully to me.
"As a driver it's essential to feel comfortable in the car, but we still don't have a solution here in Italy.
"We spend a fair amount of time in the car, so it's important to make improvements," Bottas added.
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