British No.2 Aljaz Bedene has lost his appeal against a decision to stop him playing for his adopted country in the Davis Cup.
The 26-year-old was born in Slovenia and represented them in three Davis Cup ties before becoming a British citizen last March.
The International Tennis Federation introduced a rule later in 2015 that players would not be allowed to play for a second country in the most prestigious team competition in men's tennis.
"Of course I am very sad with today's result and that it has not gone the way I had hoped," world No. 57 Bedene said.
"I will have to assess my situation now before I decide on what steps to take next."
Britain, led by Andy Murray, won the Davis Cup last year for the first time since 1936.
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