Chelsea announced that Frank Lampard will take over as their new head coach on Thursday after Maurizio Sarri left to join Juventus last month.
Lampard will take two coaches with him from Derby to Stamford bridge, with Morris joined by Chris Jones.
Morris, 40, played for the Blues from 1996 until 2003, and was always likely to make the move with Lampard back to London.
Shortly after the announcement was made, the former Leeds United and Millwall midfielder made his thoughts clear to both Chelsea and Derby fans.
“What can I say,” Morris posted on Instagram after Chelsea’s announcement.
“This last year I’ve made some of the most amazing memories and experienced some of the most euphoric feelings in my football career.
“The warmth in which the city embraced us was evident from day one and continued throughout our time in Derbados.
“The fans enthusiasm and love for this great football club was apparent whenever you walked in the city.
“I’m so proud and privileged to have felt that from the off Mel Morris was quite simply a class act.
“I’m not sure anybody yearns for success in DE24 more. A true fan who is passionate about his team.
“Thank you so much to the players that bought into what we tried to do straight away and gave us all such a great ride.
“I’ll never forget some of the moments we experienced together.
“I loved watching you grow as a group and want nothing more than for you to be successful and keep improving as players, no matter what stage of your career you’re at.
“To all the Rams out there I hope you understand how much we appreciated your support.
“The silence of late which some of you took as disrespect was the complete opposite, we had no choice but to keep quiet while negotiations were ongoing and would never want to mislead anybody.
“I hope you can see we have nothing but love and respect for this football club.”
