Loeb will only contest four rounds of this year's series - and last week's Leon- based event was the first event the nine-time champion missed.
He will also skip the next rally in Portugal before returning in Argentina.
Ogier finished second to Loeb on the season opener in Monte Carlo before beating the Citroen star in Sweden.
"For sure," said Ogier, "we knew at the beginning of the season, without Loeb in the team they lost a strong part. In the rally, the driver has a big input.
"We all know that in the rally you need a good car and a fast car, but if you are a good driver then sometimes you can make the difference."
Asked if he thought Citroen had made the wrong choice in dropping him in 2011, Ogier added: "I don't know if they made the wrong choice, but for myself, I know that I made the good choice!"
Ogier and Loeb were team-mates at Citroen in 2011, before the former was ousted from the team under acrimonious circumstances.