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They finished three points clear of defending champions Club Brugge, after playoff between the six best teams from the regular season.
USG qualify directly for the group stage of next season's UCL when they will have to stage matches away from the Joseph Marien Stadium, their home since 1919.
The 9,000-seat stadium's Art Deco-style facade may have earned it a place on the Brussels heritage list, but the ground perched on the wooded hills of Forest, one of the 19 municipalities of the Belgian capital, does not meet UEFA standards.
"I know many who wondered if they would ever win a title again and who have since died. It's them I'm thinking of," said the 76-year-old former club president and former mayor of Saint-Gilles, Charles Picque.
The club, founded in 1897, won the Belgian league 11 times between 1904 and 1935 before a long period of decline.
