The blue-liner didn't demand a trade but did request they consider moving him if he doesn't fit in their plans going forward.
"He's not unhappy with Buffalo, he's just looking for more of an opportunity to play," Hughes said.
Beaulieu was traded to Buffalo from the Montreal Canadiens during the 2017 offseason. In his second season with the Sabres, he's notched three goals and four assists while logging 14:46 per contest.
The 26-year-old carries a cap hit of $2.4 million and is a restricted free agent after this season.