"This was an extremely tough decision, and I hope people on both sides will take that the right way," Walker wrote.
Kemba Walker is eyeing success in the playoffs after agreeing to sign with the Boston Celtics.
The Nets made a pair of major moves Sunday while the Celtics landed a new star.
Boston is the landing spot for the three-time NBA All-Star.
Rozier, 25, averaged 9.0 points, 3.9 rebounds and 2.9 assists per game for the Celtics in 2018-19.
Walker reportedly agreed to a four-year maximum contract worth $141 million with Boston, which he is expected to sign Sunday.
Boston is the rumored landing spot for the three-time NBA All-Star.
The futures of Kevin Durant, Kawhi Leonard and Kyrie Irving are the major talking points ahead of the start of NBA free agency.
Walker and the Hornets have reportedly experienced "sizable gaps and stalemate" in their contract discussions so far.