Amari Cooper has a strong relationship with Dallas Cowboys quarterback Dak Prescott.
The 24-year-old wide receiver was sent from the Oakland Raiders to the Cowboys in late October in exchange for a first-round pick.
Cooper said he instantly clicked with Prescott.
"I feel like the only way to go is up with me and Dak," Cooper said, via the Dallas Morning News.
"We just have a natural chemistry. That's rare, because you can't just combine two players, a receiver and a quarterback, and say, 'Hey, just go out there and have a good game.'
"It takes the quarterback and the receiver, their skill-set has to match. And it just happened like that."
Cooper caught 53 passes for 725 yards and six touchdowns during his nine regular-season games with the Cowboys. He also added 13 receptions and a score in the playoffs.
He said his connection with Prescott has improved in the offseason.
"We've been practicing. We've been throwing," Cooper said. "I know him a lot more. I know how he likes to throw the ball. He knows how I like to run my routes. I feel like we're getting better."
Cooper and Prescott will both be free agents after 2019. Dallas owner and general manager Jerry Jones said last week the team are having "active discussions" about extending both players.
"Certainly, if there are opportunities there that make sense, then we'll progress," Jones said. "I think pretty much everybody's on it pretty good that there's some pretty active discussions now with Dak and Amari.
"But it doesn't mean that some can't pick up in short order with other players that we have on our roster that we certainly want to keep here in Dallas and have them remain Cowboys in the future."
The Cowboys originally selected Prescott in the fourth round of the 2016 draft. They have recorded a 32-16 record in Prescott's starts and reached the playoffs in two of his three seasons.