Alonzo Shavers, the agent for cornerback Asante Samuel, confirmed that an extension was not reached with the Patriots.
"Collectively, between the two of us, we were not able to strike a deal," he said.
Shavers was asked about the possibility of Samuel holding out.
"That option remains on the table for him," he said. "He's going to make those decisions behind closed doors."
Asked about Samuel's reaction to the deadline passing, Shavers said: "Obviously, he's disappointed. But he's a professional, and he's aware of the team he plays for, the situation he's in, and his reaction was what it should be, one of continued professionalism."