Aims and Objectives/Purpose/Research Questions: While evidence for proactive language control processes has been found during single word production, very little, and conflicting evidence has been observed for such control processes during sentence production. So, the main goal of this study was to investigate whether proactive language control can occur during sentence production. Design/Methodology/Approach: To investigate proactive language control during sentence production, we relied on a description task in single and mixed language blocks. Data and Analysis: Mixing costs and the reversed language dominance effect of language intrusions and filled pauses were used to examine proactive language control. Findings/Conclusions: Evidence for proactive language control during sentence production came from the mixing cost effect observed with both language intrusions and filled pauses. Whereas no reversed language dominance effect was observed in mixed language blocks, a significant difference in language pattern was observed between single and mixed language blocks indicating that proactive language control of the first language might be implemented in mixed language blocks during sentence production. Originality: Unlike the vast majority of studies investigating language control, this study relied on sentence production instead of single word production. Moreover, to the best of our knowledge, this is the first study to examine filled pauses to gain insight into language control. Significance/Implications: These data indicate that proactive language control can be implemented during bilingual sentence production.