“I’m here because Roma are a great team,” he explained, “and Rome is a beautiful city.
“I will give my all for the shirt, which is very important. I have been told a lot about the Giallorossi supporters, some of the most beautiful supporters out there.”
Vainqueur made his breakthrough in his native France with Nantes, playing five seasons before earning a move to Standard Liege.
He will have two weeks to get used to his new team-mates over the international break before the Giallorossi visit Frosinone in their third game of the season.