PEMBROKE PARK, Fla. -

Massachusetts State Police served Miami Dolphins center Mike Pouncey with a subpoena relating to an investigation into former New England Patriots tight end Aaron Hernandez on Sunday, shortly after the Patriots beat the visiting Dolphins in Foxborough, Sports Illustrated reported.

Hernandez was charged this year with first-degree murder in the June shooting death of his friend Odin Lloyd. A source with knowledge of the matter told SI.com that Pouncey's subpoena has to do with Hernandez's possible ties to gun trafficking.

The subpoena means a grand jury investigating Hernandez wants to talk to Pouncey, but doesn't mean Pouncey is being charged with a crime or is implicated in wrongdoing.

"I think if there weren't something serious about this that they would have tried to interview him informally rather than give him a grand jury subpoena," said Local 10 legal analyst Lee Stapleton. "He's trying to find out either what he knows about Aaron Hernandez as a man or what he knows about Aaron Hernandez as his partner in crime."

Pouncey, 24, and Hernandez, 23, were teammates at the University of Florida.

After the Patriots defeated the Dolphins 27-17 at Gillette Stadium, police officers in suits gave Pouncey a piece of paper in a hallway between a locker room and the Dolphins' bus, SI.com reported.

"It's about a grand jury investigation," a police official told Pouncey, adding later, "Make sure you arrive," according to SI.com.

During his weekly news conference Monday, head coach Joe Philbin said the team is focused on its upcoming game against the Cincinnati Bengals.

"We're obviously aware of the reports regarding Mike and consistent with my response to non-football related matters, I have nothing further to say," said Philbin.

CNN requested comment from the Dolphins, the NFL, the Massachusetts State Police and the district attorney's office prosecuting the Hernandez case in Bristol County, Massachusetts. Representatives from each declined to comment Sunday night.

Hernandez was arrested in late June, 10 days after authorities say Lloyd, a 27-year-old semi-pro football player, was killed in Massachusetts.

Authorities have said that Hernandez, Ernest Wallace and Carlos Ortiz picked Lloyd up from his Boston apartment in a rental car shortly before he was found shot to death on June 17 in a North Attleborough, Mass., industrial park.

Hernandez pleaded not guilty in September to a charge of first-degree murder. Wallace and Ortiz have pleaded not guilty to charges of being an accessory to murder after the fact.