One of the alleged Jersey boy jihadis charged with attempting to provide support to ISIS after ranting about beheading infidels and attacking Jews was once an aspiring football prospect at a posh Catholic high school in Manhattan.

Tomas Kaan Jimenez-Guzel, 19, who was arrested on Nov. 4 at Newark Airport while trying to flee to Turkey, attended Chelsea’s $26,460-a-year Xavier High School for freshman year before transferring to Montclair High School where he studied alongside Milo Sedarat , who was also arrested for attempting to provide material support to the terror group.

Xavier High School acknowledged the connection and decried the alleged radicalization of Jimenez-Guzel in a letter sent out Friday to the community, which was obtained by The Post.

“Tomas transferred out of Xa

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