鲁伊·迪亚兹·的·古兹曼的《Anales del descubrimiento, población y conquista del Río de la Plata》被认为对巴斯托斯的写作产生了重大影响。[27]古兹曼是瓜拉尼西班牙混血探险家,他曾用瓜拉尼语以虚构的笔法广泛的描写巴拉圭的地理风貌。然而巴斯托斯更直接的先驱者是拉菲尔·巴雷特(1876——1910),他的作品包含了许多重要的主题和写作风格,这些主题和风格后来被罗亚·巴斯托斯熟练的使用,它们包括:瓜拉尼式西班牙语、魔幻现实主义、巴拉圭历史的重构、社会文学、对集体记忆和诗歌意象系统的探索。[28]巴雷特的《Yo que son los yerbales》是对巴拉圭茶种植园剥削工人的严厉批判。巴斯托斯1940年代早期的部分作品处理的是同一问题,尤其是第一步主要小说《人子》的许多人物角色与之暗合。[29]乌拉圭作家奥拉西奥·基罗加也给了他重要影响。[30]
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