Antoine Griezmann scored a brace to take Didier Deschamps' men into the decider courtesy of a 2-0 win over Germany.
The tournament hosts are favourites to win a first major trophy in 16 years when they take on Portugal in Sunday's decider.
But Evra told his team-mates not to underestimate Fernando Santos' side, who have been described as ugly on their way to the final.
"It's a big match. Portugal is a very good team, one that was very much criticised," the Juventus man told beIN Sports.
"People said they hadn't won a game in 90 minutes. Everyone said Croatia was going to make it and if Portugal is there it's not for nothing, they deserve to be there.
"A final is a final, I'm going to play against some old team-mates there. It's a big moment, but there are no gifts here."
Cristiano Ronaldo and Nani, who played with Evra at Manchester United, will be among his opponents in Paris.