The Aprilia rider was cycling at Mugello on Thursday when he had a “big, big crash”, injuring his back, arm and “destroying” his heel.
He said he is now in “a lot of pain” and though nothing was broken in the crash, is unable to use his rear brake.
Despite his injuries, Espargaro finished ninth in the combined timings for FP1 and FP2, and will head straight into Q2 on Saturday.
Speaking about the crash, he said: “It was a stupid thing.
“I decided to go out to do two hours and it was quite foggy yesterday morning, so I said to myself okay, stay in the track, it’s more safe.
“Being on track, I was more relaxed so I was using my telephone like stupid and I had a big, big, big crash.
“I hurt all my back and arm and everything, big crash, but this is not the biggest problem.
Source: Autosport