Ijalana, 29, is a former second-round pick of the Colts back in 2011. He lasted just over a year in Indianapolis before he was waived and later claimed off of waivers by the Jets.
Ijalana signed a two-year, $11 million contract with the Jets last year and was set to make a base salary of $4.5 million for the 2018 season. The Jets declined his option this offseason only to re-sign him in March.
In 2017, Ijalana was active for 11 games and played a total of 56 snaps for the Jets, according to Pro Football Focus.
Gradkowski, 29, is a former fourth-round pick of the Ravens back in 2012. The Panthers signed Gradkowski to a three-year, $3.15 million contract in 2016, but he was placed on injured reserve back last year and later released him with an injury settlement.
In 2016, Gradkowski appeared in 10 games for the Panthers and is rated by Pro Football Focus as the No. 33 center out of 37 qualifying players.