Xavi, it is learnt, "sent an email from his own account" to apply for the post.
Beat Mexico's Tigres 1-0 to win their sixth title.
The reigning Ballon d'or winner gave a perfect start to his side's new campaign by scoring twice in Madrid's comfortable 3-0 win over Cypriot visitors APOEL in the opening match.
Dutchman Ronald Koeman has signed a two-year-deal with Barcelona.