Jorge Lorenzo thought he had suffered serious damage when he landed heavily after a horrific high-side in Saturday's third practice at Motegi.
The Yamaha rider was airlifted to a local hospital following the high-side, which saw him hit the dirt hard and needing to be stretchered off.
Despite fearing the worst, Lorenzo was given the all-clear in the scans and returned to the Motegi circuit in time for FP4.
"It’s been a long time since I had a crash like today – flying a lot of meters in the air with a bad landing," he told MotoGP.com.
"I was scared and expected the worst, especially my left leg, but it was just a warning.
"So we went to hospital as a precaution and then came back for FP4."
Huge drama for #JL99 on his OUT LAP
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He added: "With the adrenaline and some painkillers in qualifying I forgot the pain."
Lorenzo later qualified his Yamaha on the front row for the Japanese MotoGP, securing third place behind Valentino Rossi and Marc Marquez.
"I was much better than I thought and ready to fight for pole – but then the lap times from Rossi and Marquez were very strong, especially Rossi’s lap time following Viñales.
"I think we have good pace and a chance to fight for the victory."