As Luis Suárez broke English hearts on Thursday night, the camera panned across the euphoric crowd of Uruguay fans, and there bouncing amid them was a Scottish man, sporting a tartan bonnet and furiously waving the saltire.

By yesterday morning, the celebrations had gone viral around the world and the 41-year-old Mark McConville found himself the latest internet sensation, as well as an example of the enduring Caledonian insistence on supporting "anyone but England".

His brother, Gerry McConville, admitted Mark is a "big fan" of the pro-independence yes campaign, although he told the Guardian it was not true that his brother was deliberately supporting the England team's rivals. "That's just rubbish. He supported Uruguay in the last world cup and he's got special tickets that mean you have to follow whoever gets through into the next round. If England were a bit better at football then maybe he'd be following them all the way to the final."

He said he had not been able to contact his brother this morning, so had no idea whether he was aware that his presence in the crowd had come to international attention.

Mark McConville worked until recently in Northampton as an engineering contractor for Mercedes-Benz High Performance Engines, but grew up with his three brothers on the Arden estate on the south-west edge of Glasgow.

He began his trip by making a 300 mile (500km) trek up the Amazon river to deliver football kit donated by friends on Facebook to an orphanage. He made a similar charity drop-off to disadvantaged children when he attended the 2010 World Cup in South Africa. After this tournament, he plans to visit another brother who lives in Costa Rica.

Greig Taylor, an old friend who played in the same football team as McConville when he lived in Glasgow, says he wasn't surprised to see his pal become an online sensation. "He's always been larger than life," says Taylor. "His one-liners are legendary. He's daft but very intelligent, and a very nice guy. Describing his friend as "very Scottish, very Celtic, very yes", he adds that he is "not very enamoured with the union, to put it politely".

Research for Ipsos Mori found that 20% Scots who were interested in this year's World Cup wanted England to win, with only 5% saying they would support "anyone but England".