The world number one said how he felt on court on Sunday was “completely like a different player entered into my shoes. Just no rhythm, no tempo, no balance whatsoever on any shot”.
“It’s a bit concerning,” he added.
Djokovic, a 24-time grand slam champion, was beaten in round three in Rome by 26-year-old Chilean Alejandro Tabilo, who won the match 6-2 6-3 in just 67 minutes. It was one of the Serbian’s worst displays at one of his favourite tournaments.
The 36-year-old sports star was signing autographs on Friday following an earlier win when he collapsed on to the ground after the container, which fell out of a spectator’s rucksack, struck him from above.
Speaking on Sunday about the incident, Djokovic said: “It was unexpected obviously. I wasn’t even looking up. Then I felt a very strong hit in the head. That has, yeah, really impacted me a lot. Been through half an hour, an hour of nausea, dizziness, blood, a lot of different things.
“I managed to sleep okay. I had headaches. The next day was pretty fine, so I thought it’s okay. Maybe it is okay. Maybe it’s not.
The top seed added: “I didn’t do any scans or any tests. Right now, I feel like I should do it, so I will do it and let’s see. Let’s see what’s happening.”
