Messi opened the scoring at the Parc des Princes but pulled up with a problem just before the interval.
The club's official Twitter account confirmed soon after that Messi has picked up a problem and will undergo further tests tomorrow.
A tweet from the club's account read: "Messi sustained an injury to his right hamstring. He will undergo further tests on Wednesday to determine the extent of the injury."
You can follow Barca's progress in the second half against PSG with Sports Mole's live text commentary by clicking here.