Andreou had his first exhibition in Paris in 1951, where he demonstrated the transformation of his style. In the group exhibition "Seven Greek Sculptors", Andreou was characterized as "the most famous Greek sculptor in the capital with a rich, varied and successful work". By the end of the decade, Andreou was widely known in the French art scene and considered an equal to Mondrian, Picasso and Gastaud. In 1982, he was given the lead as chairman of the Paris "Autumn Salon" for sculpture.