Just days before the New England Patriots took on the Miami Dolphins this week ... Robert Kraft's son was focused on another big football game ... in Israel.
TMZ has learned ... Daniel Kraft flew into Jerusalem a few days ago to check in on the Israel Football League ... a 10-team semi-pro organization largely supported by the Kraft family.
The family is so involved with the league -- the field was named Kraft Stadium.
On Thursday, Daniel and his son were honored at the annual Hanukkah Bowl -- with his son lighting the menorah on night #3.
After Daniel greeted the crowd in Hebrew, the Judean Rebels beat the living kreplach out of the Jerusalem Kings ... 66 to 20.
Pigskin -- finally kosher in Israel.