Decker will sign a contract worth $36.25 million over five years with $15 million in guarantees, according to local reports.
Decker, who turns 27 on Saturday, was a member of Denver's record-breaking offense last season that set an NFL mark for points in a season and reached the Super Bowl.
With quarterback Peyton Manning throwing to him, Decker set individual career-highs with 87 receptions and 1,288 yards.
The Jets, on the other hand, were one of the worst offenses in the NFL and are looking to build with second-year quarterback Geno Smith.
(Writing by Jahmal Corner. Editing by Patrick Johnston)