Griezmann has scored just six times in La Liga this season.
Pogba endured a similar rough patch during the first-half of this season but remained involved with the France squad.
And Deschamps says Griezmann's place in the France squad is not in doubt.
Deschamps told beIN Sports of Griezmann's situation: "He may not be playing at his best, but that is not to question his quality. It would be indecent to question his presence in the national team.
"In November, Paul was going through an even more difficult period with Manchester United. Being with us gave him a boost and he had a great game against Portugal. Antoine's case is the same, it's a matter of trust.
"They know that in the France team they are in a different environment. All the players can go through a bad period at their club, but I maintain the confidence I have in them.
"The players must bear in mind that there is competition. If at some point I think that a young man has less experience but can bring something more to the team, I will not hesitate to count on him."