LONDON — Andrés Iniesta and Xavi Hernández have played tiki-taka since childhood. They have grown closer than brothers, can find one another with a pass in their sleep and have won every honor in the global game.

Their days together are numbered.

They do have unfinished business because Barcelona still might win, three more trophies this season to add to the 24 that they have won as integral parts of both their club and the national team, Spain.

But a week ago, Iniesta was being booed in Amsterdam while Xavi was in Qatar, which is widely reported to be his new home once this season ends.

Barça’s president, Josep Maria Bartomeu, has made it clear that Xavi, now 35, has earned the right to choose when he leaves Camp Nou. New York City F.C. would pay a fortune for his reputation to grace its new franchise in Major League Soccer, but the indications are that Xavi will follow the route of one of his mentors, Pep Guardiola, who played in Doha, Qatar, at the end of his career before he started coaching.