The origin of Proto-Slavic palatal(ized) consonants has interested many linguists. Some of them have tried to connect palatality and velarity of Slavic consonants with the influence of Turkic consonant palatalization or velarization dependent on vowel harmony. This paper is a first study allowing for Turkological point of view and striving to show that there still are many doubts about the Proto-Turkic influence on Proto-Slavic.