Carlos Cuellar has revealed he was 'honoured' to be handed the Sunderland captaincy against Premier League champions Manchester City on Boxing Day.
The Black Cats secured a famous 1-0 victory at the Stadium of Light thanks to Adam Johnson's winning goal.
And the Spanish defender, who took over the armband in John O'Shea's absence, admitted he was lost for words at the final whistle after witnessing some special scenes.
"I can't describe it - it was unbelievable," Cuellar told the club's official website.
"We put everything - 100% - into every action, every tackle.
"I think we played some nice football and could have scored more goals on the counter-attack. Everyone can be proud.
"For me it is an honour to captain this football club for the first time and to achieve three points.
"It's a special day and the feeling is unbelievable."
Sunderland have now won three out of their last four matches and Cuellar believes the team's positivity against City showed exactly how much progress they've made in recent weeks under manager Martin O'Neill.
"I think we are starting to show how good we can be," he said
"From the first minute we tried to play. You have to be brave to play forward against City.
"They had chances, but that is normal. It is impossible to play against Manchester City without them creating chances."