A six-time champion and six-time runner-up in Rome, Djokovic said he had struggled with balance and coordination since a water bottle fell on his head while signing autographs after beating Corentin Moutet in his opening match.
He made light of the incident by making his way to practice courts in between matches wearing a bike helmet.
But when the 36-year-old was asked whether he was affected by the incident in his loss to 26-year-old Tabilo, he suggested he was.
"I don't know, to be honest. I have to check that," Djokovic said.
"Training was different. I was going for kind of easy training yesterday. I didn't feel anything, but I also didn't feel the same.
"Today under high stress, it was quite bad — not in terms of pain, but in terms of this balance. Just no coordination. Completely different player from what it was two nights ago.
"Could be. I don't know. I have to do medical check-ups and see what's going on."
Novak Djokovic, Roger Federer, Rafael Nadal and Serena Williams had the tennis world on their shoulders for 20 years. As the landscape shifts, it's worth remembering they are outliers for a reason.
Just two weeks out from the start of the French Open, Djokovic is still hunting his first title of the year, although when he was last in the same situation he recovered to win Wimbledon and the US Open, plus two more Masters titles.
Regardless, the 24-time major winner admitted to being concerned after another loss took his record in 2024 to 12 wins, five losses and still no finals.
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