Nir Bitton picked up an injury during Celtic's friendly with Barcelona.
Bitton damaged his knee in the first half of the contest, and he was forced off at half-time.
Rodgers has warned that the problem could be a serious ones, with the midfielder set for scans today.
“Our only negative was the injury to Nir which looks a nasty one,” Rodgers said. “We’ll assess it and see how serious it is over the next 24 hours.”
Celtic lost the friendly 3-1 to Barca, but their performance against Luis Enrique’s side was largely encouraging.
The Spanish giants retained possession for large spells, but Celtic gave them a good challenge.
Barcelona took the lead in the contest in the first half when Arda Turan curled in a wonderful finish, but Leigh Griffiths levelled things up.
At that point Celtic looked to push on, but their hopes of winning the fixture took a blow when Efe Ambrose scored an own-goal and Barcelona went on to hammer their advantage home, with Munir completing the scoring.
Celtic kick off their Scottish Premiership campaign at the weekend, with a match against Hearts.