The New England Patriots have signed Mike Gillislee to a two-year offer sheet worth $6.4 million, according to sources.

The Buffalo Bills have five days to decide whether to match the offer sheet.

Gillislee would make $4 million in the first season.

The Bills placed an original-round tender on Gillislee worth $1.797 million, meaning the Patriots would send a fifth-round pick to the Bills if Buffalo declines to match.