Juventus worried about Buffon before the match against Real Madrid?

Gianluigi Buffon has not trained with Juventus first team today.
Juventus is preparing for the Champions League final.

But in this training Juventus captain Gianluigi Buffon did not train with the team as he usually does, he trained separately from the rest of the team.

Buffon did not appear into the field, despite the fact that yesterday was the day when players and staff were open to the media.

It is not yet known  whether he has suffered any serious injury, or was just resting before the most important match this season against Real Madrid.