Many of the remaining players in the Europa League probably hoped that December’s draw for the last 32 would pit them against Manchester United but none of them hoped for it as ardently as one Saint-Étienne defender.

“I watched the draw and, when I saw who we got, my first reaction was: ‘Yes, that’s a dream that’s going to be fulfilled,’” says Florentin Pogba, whose dream is shared by his whole family. “They will all be in the stadium watching, including Mathias, I think,” says Florentin. Mathias is his twin brother, a forward for Sparta Rotterdam. The pair played on the same youth teams together, first while growing up as children to Guinean immigrants in Roissy-en-Brie, Paris, and then after joining Celta Vigo in Spain at 16. But neither has ever played with or against their younger brother, Paul, United’s world record signing.

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“The rules in the youth league we played in was that no player could play in an age group more than two years above his actual age no matter how good or big he was,” says Florentin, who is three years older than Paul. “Of course we played together informally – there was a pitch just across from where we lived and we’d go there every day. At first Paul played with the guys his own age but soon that stopped being fun for him so he came to play with us. He was always excellent technically but he used to get pushed off the ball at the beginning because he wasn’t built like the older guys but once he toughened up he thrived.

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“We used to play every day and hope that one day all three of us would play together in a professional match. That was the biggest dream. We haven’t managed it yet but having two of us together on the pitch is already good.”

Florentin and Mathias were born in Conakry before the family emigrated and later pledged their international allegiance to Guinea, whereas Paul opted to play for the land of his birth, France. Florentin and Mathias did wear French jerseys, however, when supporting their brother from the stands during Euro 2016. “We are each others’ biggest supporters and I am proud of everything we have achieved,” says Florentin.

“We have all made a lot of sacrifices to become professionals. Leaving home when we were very young, for example, was really hard. Mathias and I were 16 when we went to Spain and, if that was tough for us, it was even harder for our parents. But ultimately they accepted that making it in football is a fight, nothing comes easy.”

Florentin moved back to Sedan in France after two years in Spain and then joined Saint-Étienne in 2012. Mathias, meanwhile, has played for seven clubs since Celta Vigo, including Wrexham and Crewe Alexandra. At the same time as Florentin and Mathias went to Spain, their parents, Fassou and Yeo, also waved goodbye to Paul, although at least he went only as far as Le Havre at first. But when he reached 16 he, too, left the country, joining Manchester United for the first time before heading to Juventus three years later to become a big-time player in earnest. Four Serie A titles later he returned to United as the world’s most expensive player but, says Florentin, as the same person.

“The transfer fee is just a detail,” says Florentin. “He didn’t decide it. There are some crazy aspects to the world of football. Some of them are bonuses, some of them are real challenges but the most important thing is the same all the way through – the game and the love for it. Paul is exactly the same person now as he always was. He hasn’t been changed by the transfer fee or anything else. The only thing I feel about his success is happiness because I know how hard he worked for it.”

Apart from his footballing prowess, Paul seems blessed with a personality that makes handling his status hassle-free. Rather than wilt in the spotlight he seems to revel in it. Was he always like that? Have his older brothers helped him navigate through the business?

“Because he progressed so much more rapidly he learned how to manage everything very quickly – he had to,” says Florentin. “Of course we talk all the time but I don’t know how much influence that has had. What I do know is that he works hard and takes things in his stride.”

Facebook Twitter Pinterest Florentin and Mathias Pogba with their mother Yeo before last summer’s Euro 2016 final. Photograph: Jean Catuffe/Getty Images

Paul’s rise could conceivably have had a negative effect on the careers of Florentin or Mathias, as constant comparison to the world’s most expensive player could have become irritating or worse. But Florentin, too, takes things in his stride. “Of course there are times when I’m referred to only as ‘the brother of’. But why should that bother me?” he says. “I’m proud of my family and, besides, whenever I hear that stuff I always think that nearly every other player on the pitch is also someone’s brother.”

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It is just that usually most people do not know the other players’ brothers. Florentin, meanwhile, does not know what it will be like playing against his sibling. “Playing with Mathias was brilliant. We had an understanding that is very difficult to explain. We just instinctively knew where each other was and what we were going to do,” he says. “Playing against my brother, on the other hand, will be something new. We’ve been having fun about it ever since the draw, sending messages like ‘Watch out, the match is getting closer’ and so on.”

They also have regular amusing exchanges about other matches - because of Florentin’s devotion to one of United’s rivals. “Arsenal are the club of my heart,” he says with glee. “I’ve supported them ever since the Invincibles – what a team! The downside of being a professional is you rarely get a chance to go to watch other teams so I’ve never actually been to the Emirates. But one day I will, hopefully.”

One day, indeed, he may play there. There were reports of interest in him from several Premier League clubs last summer, including Sunderland. “There were contacts but nothing concrete,” he says of the speculation.

The question of support, of course, raises the issue of how the rest of the Pogba family will follow Thursday’s match. “It’s very much a case of everyone wanting us both to play well and may the best team win,” says Florentin.

Saint Étienne are in decent form in Ligue 1, their chase for a European spot helped by last week’s rousing victory over fierce their local rivals Lyon, a match in which Florentin excelled at left-back, having been moved from his usual position in the centre. He could play in either position against United.

“Of course United will be a tough match for us but it will also be tough for United,” says Florentin, who offers only one other prediction for the match. “I’ve never asked a player to swap jerseys at the end of the game, although I do have some because when I’ve played against friends we’ve just sort of swapped spontaneously. I think that after this game there’ll be a quite natural exchange of shirts.”