The Buffalo Bills stand to lose Ryan Bates after the offensive lineman agreed to sign an offer sheet to play for the Chicago Bears.

The Chicago Tribune first reported the move late Thursday.

Once the offer sheet is filed with the NFL, the Bills will have five days to match the Bears’ offer or lose Bates without compensation. A restricted free agent, Bates’ rights were retained by the Bills last week when the team tendered him a one-year, $2.433 million contract.

The value of the offer sheet was not revealed.

Buffalo has very limited space under its salary cap, which already counts Bates’ contract, and the team would have to free up additional space to match the Bears’ offer.

He’s a third-year player who went undrafted out of Penn State and was acquired by Buffalo in a trade that sent defensive end Eli Harold to the Philadelphia Eagles in August 2019. Noted for his versatility for being able to play each position, Bates appeared in 41 games, including four starts last season with the Bills.