Neymar is a huge threat to the Madrid team as PSG are preparing to visit the Santiago Bernabeu for the first leg clash.
Carvajal, who wouldn’t be featuring in the opening clash due to suspension, said his team simply needed to believe the Brazil international was below his best.
“You just hope he doesn’t have his day. I hope he doesn’t have his day on Wednesday.”
Having struggled in LaLiga this season, the Champions League is set to be Madrid’s last chance at another trophy this campaign.
Carvajal insisted there were no favourites for the tie against PSG, who are flying high in Ligue 1.