Lionel Messi, who is yet to score for PSG since his move in the summer, was substituted in the second half of Sunday’s league win against Lyon.
Messi will miss Paris Saint Germain’s visit to Metz in Ligue 1 on Wednesday because of an injury to his left knee.
Messi, who was substituted on his home debut against Lyon on Sunday, underwent an MRI scan which confirmed signs of bruising to the bone.
The French league leaders confirmed on Tuesday the forward would undergo a follow-up examination in 48 hours.
Messi, 34, has not scored in his first three appearances since he joined on a free transfer in August following his departure from Barcelona.
Mauricio Pochettino’s side are due to play against Montpellier at home in the league on Saturday before hosting Manchester City in the Champions League on Tuesday.