Letexier will be joined at Sunday's final by French assistants Cyril Mugnier and Mehdi Rahmouni, while Szymon Marciniak (Poland) will be fourth official.
Romanian Itsvan Kovacs will be the fourth referee.
Experienced Argentine official Nestor Pitana will referee the World Cup final between France and Croatia at the Luzhniki Stadium on Sunday, an uncontroversial decision which rewards his authoritative performances in Russia.
Gonzalo Higuain scored his 30th league goal of the season but was later sent off and had to be restrained by his team mates as Napoli lost 3-1 at Udinese on Sunday, severely denting their Serie A title hopes.
Napoli maintained their two-point advantage at the top of Series with a 2-0 victory at Lazio on Wednesday in a game suspended due to racist chanting as Juventus beat Genoa 1-0 to break a club record for consecutive league wins in a single season.
Argentine referee Nestor Pitana will take charge of Thursday's opening World Cup match between hosts Russia and Saudi Arabia in Moscow, FIFA said on Tuesday.
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field