The most common and most likely answer to this crossword clue is the 8 letter word CUP-TIED
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Buddy explains!

The straight part
We know that "ruled out of match" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ruled out of match = cup-tied.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CUP-TIED mean?
CUP-TIED adjective- (of a player) ineligible to compete in a cup competition due to having previously played for a different team in the same competition in the same season.