Nigel Worthington's reign as full-time Northern Ireland manager got off to a losing start as Bulgaria edged a tight friendly at Windsor Park.

Manchester City midfielder Martin Petrov did the damage when he broke through on goal after 38 minutes, although it was defender Jonny Evans who had the final touch in a desperate attempt to clear.

Northern Ireland's best chances fell to David Healy but the province's most celebrated goalscorer was unable to add to his international tally of 33. It was his country's first defeat on home soil in seven matches.

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