Earlier this week, the team attempted to sign Martin Rucker off of the Dallas Cowboys' practice squad. Dallas made the same offer to Rucker, who elected to join the Cowboys' active roster. Buffalo then turned their attention to Mike Caussin, a former member of the Jacksonville Jaguars' practice squad who was officially added to the Bills' active roster Thursday.
Chandler was released from Dallas' active roster to make room for Rucker; the Cowboys planned to re-sign Chandler to their practice squad if he cleared waivers. In his fourth year out of Iowa, the 6'7", 272-pound Chandler has never recorded a reception in the NFL, but is viewed as a solid blocker.
Buffalo currently has four tight ends on its active roster, with Nelson being the only one currently on the injury report. It's unclear at this point if Chandler has been awarded to the Bills; if he has, it's also unclear which player the team will move off the active roster to make room for him.