The former Arsenal star announced his shock retirement aged 34 last March.
He has since hit the gym, bulking up big time.
After posting a video of himself training, Ozil attracted attention from his former team-mate Ronaldo.
The Portuguese, himself a huge gym-rat, commented: “Bro not bad.”
Ronaldo, 39, followed his comment up with a wink emoji.
Ozil, 35, captioned his post: “Always stay ready, then you don’t need to get ready.”
The German received over one million likes, with plenty of other footballers past and present leaving comments.
Rio Ferdinand wrote: “Looking strong bro.”
While Antonio Rudiger called him a “beast”.
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Franck Ribery left a heart emoji.
And former Brazil star Ze Roberto added: “Machine.”
Newly-bulked up Ozil could be back in action this summer.
The Over-35 World Cup is set to kick off in England in June.
It is set to feature a star-studded line-up, with Ozil on Germany‘s draft list alongside the likes of Sami Khedira and Kevin Kuranyi.