According to a report in TechCrunch on Friday, the feature could soon let you use voice to dictate and send messages, initiate voice calls and create reminders.
A Facebook Messenger spokesperson confirmed that Facebook is internally testing the voice command feature.
"We often experiment with new experiences on Messenger with employees. We have nothing more to share at this time," the spokesperson was quoted as saying.
Voice control could make Messenger simpler to use hands-free.
Facebook Messenger was previously spotted testing speech transcription as part of the Aloha voice assistant believed to be part of Facebook's upcoming Portal video chat screen device.
"Facebook Messenger is eager to differentiate itself from SMS, Snapchat, Android Messages and other texting platforms," said the report.
Messenger has over 1.3 billion monthly active users. Its "Stories" feature now has over 300 million daily active users.