Koo, 23, wound up signing a three-year, $1.66 million contract with the Chargers as an undrafted free agent out of Georgia Southern back in May. He was set to make a base salary of $465,000 for the 2017 season when the Chargers waived him a few weeks ago and re-signed K Nick Novak.
In 2017, Koo has appeared in four games for the Chargers and converted just three of six field goal attempts and all nine extra point tries.
Nugent, 35, is a former second-round pick of the Jets back in 2005. He has spent the past six seasons with the Bengals but has really struggled this year.
Nugent was in the final year of his two-year, $3.5 million contract and set to make a base salary of $1.2 million for the 2016 season when the Bengals cut him loose in December of last year.
The Giants signed Nugent to a contract a month ago before cutting him loose this past weekend.
In 2016, Nugent has converted 23 of 29 field goal attempts (79.3 percent) and 23 of 29 extra point tries to go along with 28 touchbacks.
Myers, 26, wound up signing on with the Jaguars as an undrafted free agent back in 2015 and has managed to make the team the past three seasons. He was in the final year of his three-year, $1.575 million contract and set to make a base salary of $615,000 for the 2017 season when the Jaguars waived him last week.
In 2017, Myers has appeared in six games and converted 11 of 15 field goal attempts (73.3 percent) to go along with 15 of 17 extra point tries (88.2 percent).