The former Sao Paulo star clashed heads with Luca Marrone and drew blood before Lazio secured their passage through to the final of the competition.
Hernanes underwent an MRI scan and was discharged after the results showed no serious damage, but claims to have no recollection of the mid-air collision.
“If it were up to me, I’d play the next game [away to Genoa],” the 27-year-old said.
"When I arrived at the hospital, they told me we were in the final and the joy drowned out the pain. I want to thank the fans who supported me and the team as they always give us positive energy."