"Sakho will be rested this weekend," Ligue1.com quotes him as saying. "Alex is back at centre-half and he'll play alongside Armand or Camara.
"It was difficult to work this week as we only got our full squad back together again on Thursday. It's a very important match for us because we'll be able to put pressure on second-placed Lyon.
"We need to be ready both mentally and physically. The players who were with us all week will be favoured for the game."
PSG are three points ahead of Lyon in the table.