Healy (pictured) scored a record 13 goals in Euro 2008 qualifying, but has yet to get off the mark in the new campaign.

Northern Ireland lost 2-0 to two late goals in Slovenia on Saturday, leaving them with just a point from three matches – ahead of San Marino's visit to Belfast on Wednesday.

"To win a game is the most important thing, but if I go a game or two without scoring there is no one more disappointed than me," said the Sunderland forward, who has started just one game for the Black Cats and cannot be at his peak of match fitness.

"I am my own biggest critic. Some people hide from the fact that they haven't played well but I go over everything in my head after a game.

"I think 'I should have shot there or headed that' and sometimes I can be a bit harsh on myself. I expect to score every time I play, whether it's San Marino or anyone else."

Manchester United's ex-Sunderland loan defender Jonny Evans is banned for Wednesday after being shown his second yellow card of the campaign in Slovenia.