Oakland Raiders tight end Jared Cook (87) warms up before an NFL football game against the New York Jets in Oakland, Calif., Sunday, Sept. 17, 2017. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders tight end Jared Cook (87) runs after the catch during an NFL football game against the Dallas Cowboys on Sunday, Dec. 17, 2017 in Oakland, Calif. Dallas won 20-17. (Peter Read Miller via AP)

Oakland Raiders tight end Jared Cook (87) catches the ball during an NFL football game against the Kansas City Chiefs on Sunday, Dec. 2, 2018 in Oakland, Calif. Kansas City won 40-33. (Peter Read Miller via AP)

Cincinnati Bengals middle linebacker Hardy Nickerson (56) breaks up a pass to Oakland Raiders tight end Jared Cook (87) in the second half of an NFL football game, Sunday, Dec. 16, 2018, in Cincinnati. (AP Photo/Frank Victores)

Oakland Raiders tight end Jared Cook (87) attempts a catch in the end zone during an NFL football game against the Cincinnati Bengals, Sunday, Dec. 16, 2018 in Cincinnati. (NFL Photos via AP)

Oakland Raiders tight end Jared Cook (87) motions to fans to get excited during an NFL football game against the Pittsburgh Steelers on Sunday, Dec. 9, 2018 in Oakland, Calif. (Greg Trott via AP)

Oakland Raiders tight end Jared Cook practices before an NFL football game against the Cincinnati Bengals, Sunday, Dec. 16, 2018, in Cincinnati. (AP Photo/Gary Landers)

Oakland Raiders tight end Jared Cook (87) runs against the Denver Broncos during the first half of an NFL football game in Oakland, Calif., Monday, Dec. 24, 2018. (AP Photo/D. Ross Cameron)

Oakland Raiders tight end Jared Cook (87) catches a touchdown against the Kansas City Chiefs during the second half of an NFL football game in Oakland, Calif., Sunday, Dec. 2, 2018. (AP Photo/Ben Margot)

Oakland Raiders tight end Jared Cook (87) catches a pass during an NFL football game against the Pittsburgh Steelers on Sunday, Dec. 9, 2018 in Oakland, Calif. (Greg Trott via AP)

Oakland Raiders tight end Jared Cook (87) gains yardage after a pass during an NFL game against the Denver Broncos, Sunday, Sept. 16, 2018 in Denver. (Margaret Bowles via AP)

Oakland Raiders tight end Jared Cook (87) runs during an NFL football game against the Pittsburgh Steelers on Sunday, Dec. 9, 2018 in Oakland, Calif. (Greg Trott via AP)

Oakland Raiders tight end Jared Cook (87) dives into the end zone for a touchdown during an NFL football game against the Indianapolis Colts on Sunday, Oct. 28, 2018 in Oakland, Calif. Indianapolis won 42-28. (Peter Read Miller via AP)

Oakland Raiders tight end Jared Cook (87) pulls in a touchdown catch as Arizona Cardinals defensive back Tre Boston (33) defends during the first half of an NFL football game, Sunday, Nov. 18, 2018, in Glendale, Ariz. (AP Photo/Rick Scuteri)

Oakland Raiders Jared Cook (87) plays against the Denver Broncos during an NFL football game in Oakland, Calif., Sunday, Nov. 26, 2017.

(Tom DiPace via AP)

Oakland Raiders tight end Jared Cook (87) runs against the Cleveland Browns during an NFL football game in Oakland, Calif., Sunday, Sept. 30, 2018. (AP Photo/D. Ross Cameron)

Oakland Raiders tight end Jared Cook (87) touchdown during a NFL football game between the Indianapolis Colts and the Oakland Raiders Sunday October 28. 2018 at the Oakland County Coliseum Oakland Ca. The Indianapolis Colts defeated the Oakland Raiders 42 - 28. in game 8. (AP Photo/Bill Nichols)

Oakland Raiders tight end Jared Cook (87) is hit by Denver Broncos defensive back Justin Simmons (31) during the first half of an NFL football game, Sunday, Sept. 16, 2018, in Denver. (AP Photo/Jack Dempsey)

Oakland Raiders tight end Jared Cook (87) runs after the catch during a NFL football game against the Miami Dolphins on Sunday, Sept. 23, 2018 in Miami Gardens, Fla. ( Tom DiPace via AP)

Oakland Raiders tight end Jared Cook hauls in a pass as Los Angeles Chargers defensive back Adrian Phillips defends during the first half of an NFL football game Sunday, Oct. 7, 2018, in Carson, Calif. (AP Photo/Mark J. Terrill)

Oakland Raiders tight end Jared Cook (87) in action during an NFL football game against the New York Giants, Sunday, Dec. 3, 2017, in Oakland, Calif. The Raiders defeated the Giants, 24-17. (Ryan Kang via AP)

Oakland Raiders tight end Jared Cook (87) makes a touchdown catch against Kansas City Chiefs defensive back Daniel Sorensen (49) during the second half of an NFL football game in Kansas City, Mo., Sunday, Dec. 10, 2017. (AP Photo/Charlie Riedel)

Oakland Raiders tight end Jared Cook (87) catches a pass next to Kansas City Chiefs cornerback Eric Murray (21) during an NFL football game, Thursday, Oct. 19, 2017, in Oakland, Calif. The Raiders defeated the Chiefs, 31-30. (Ryan Kang via AP)

Oakland Raiders' tight end Jared Cook gives a television interview during an NFL flag schools event at King's House Sports Ground in Chiswick, west London, Wednesday, July 18, 2018. (AP Photo/Robert Stevens)

Oakland Raiders tight end Jared Cook (87) celebrates his catch during an NFL football game against the Los Angeles Chargers on Sunday, Oct. 15, 2017 in Oakland, Calif. Chargers won 17-16. (Peter Read Miller via AP)