FOXBOROUGH, Mass. — A person with knowledge of the negotiations says the Patriots have picked up the option that will keep Pro Bowl tight end Rob Gronkowski in New England through 2019.

The person spoke to The Associated Press on the condition of anonymity because the Patriots had not announced the move.

The 26-year-old Gronkowski alluded to the move on Monday when he tweeted that he was taking a pay cut for the next four years. The deal made in 2012 was a six-year extension worth $54 million, including a $10 million option that would activate the deal for 2016-19. The Patriots paid $4 million of that option last year, making this week’s move a formality.

Gronkowski was the team’s leading receiver this season, with 72 catches for 1,176 yards.

LIONS: Calvin Johnson, one the most spectacular receivers in NFL history, retired on Tuesday, calling it a career after nine seasons filled with highlight-reel catches, dozens of touchdowns and nearly 12,000 yards receiving. The 6-foot-5 receiver was known as Megatron, a sign of respect for his unusual mixture of speed, power and grace.

“Let me assure you that this was not an easy or hasty decision,” Johnson said. “I, along with those closest to me, have put a lot of time, deliberation and prayer into this decision and I truly am at peace with it.”

Johnson, 30, piled up 731 career receptions for 11,619 yards, a league-record 86.1 yards receiving per game, and 83 touchdowns against defenses often geared to stop him.

JAGUARS: Jacksonville took the first step – a huge one – in rebuilding its defense, agreeing to terms with Broncos defensive lineman Malik Jackson on a six-year, $90 million contract that includes $42 million guaranteed, according to a person familiar with the negotiations.

Free agent deals cannot be finalized until Wednesday.

RAIDERS: Oakland struck early for its top target in free agency, agreeing in principle to a five-year deal with Baltimore offensive lineman Kelechi Osemele that could be worth up to $60 million, per to NFL Media.

EAGLES: Longtime Bills cornerback Leodis McKelvin has agreed to terms on a two-year contract. McKelvin, 30, spent the last eight seasons with Buffalo, which drafted him 11th overall in 2008 out of Troy University.

GIANTS: Citing unfinished business, defensive end Jason Pierre-Paul, posting on Instagram, said he has agreed to terms on a new contract with the team that made him a first-round draft pick in 2010.

BILLS: The team reached an agreement to re-sign offensive guard Richie Incognito to a three-year, $15 million contract.

CHIEFS: A person familiar with the situation said veteran linebacker Tamba Hali, coming off his fifth straight Pro Bowl, has agreed to a three-year contract extension.

VIKINGS: The team released wide receiver Mike Wallace after one unproductive season.

DOLPHINS: Tight end Jordan Cameron accepted a $1.5 million pay cut to stay with Miami.

BRONCOS: Denver released three players who helped it win the Super Bowl: tight end Owen Daniels, guard Louis Vasquez, and long snapper Aaron Brewer.