The authors present the synthetic review of literature about the Serbian vernaculars in Romania with the special emphasis on the lexical interference with the Romanian language and its Banat dialect. The paper also points to the semantic fields in which foreign lexemes apper, as well to the periods of their incorporation in the Serbian vernaculars. A special aspect of the analysis represents a status of foreign lexical items in the idiolect. At the end, the autors plead for the elaboration of the contactological Romanian-Serbian dictionary.