The Patriots needed to clear a roster spot for WR Antonio Brown, who should be officially signed by the end of the day.
Kendricks just finished serving a one-game suspension for violating the NFL’s substances policy.
Melifonwu, 25, is a former second-round pick of the Raiders back in 2017. He was in the second year of his four-year, $4.5 million contract when the Raiders waived him in November of last year.
The Patriots quickly signed Melifonwu to a contract and he finished out the year in New England.
In 2018, Melifonwu appeared in seven games for the Raiders and Patriots and recorded seven tackles and no interceptions.
Kendricks, 31, is a former second-round pick of the Rams back in 2011. He was in the third year of his four-year, $18.5 million contract when the Rams released him during the offseason.
Kendricks later signed a two-year, $4 million contract that included a $1.2 million signing bonus with the Packers back in 2017. The Patriots brought him in on a one-year during the offseason.
In 2018, Kendricks appeared in all 16 games for the Packers and recorded 19 receptions for 170 yards receiving and one touchdown.