Ozil is on the brink of leaving the Gunners, after agreeing to terminate his contract early.
The 32-year-old will join Fenerbahce this January.
The relationship between Arsenal and Ozil have been strained for years, with the German yet to make a single appearance in any competition this season.
Ozil has spent seven-and-a-half years in north London but has barely contributed for the last three.
Morgan tweeted: “Loved @MesutOzil1088 when he first came to Arsenal.
“World class player with a sublime natural talent. Now I can’t wait to see the back of the lazy manipulative £350,000-a-week wastrel.
“You could have been a club legend, Mesut – but you just couldn’t be bothered. Bye.”