So... is Dragon League finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Dragon League tells the story of Tokio and his father, Amon, as they journey to Elevenia, a land renowned for its soccer prowess.
Witnessing the Winners, Elevenia's formidable soccer team, inspires Amon to challenge their captain, Leon.
However, the match takes an unexpected turn when Amon is defeated and transformed into a miniature dragon by Leon.
Determined to restore his father to his human form, Tokio bravely steps forward to face Leon in a challenging soccer showdown.