The Wayne Rooney Mounjaro claims are fake

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The meme/claim that "Wayne Rooney lost a lot of weight because he took Mounjaro" is not a confirmed fact. In fact, Rooney personally denied it a few days ago.
It is true that Rooney has recently lost a significant amount of weight. He has looked noticeably slimmer since his BBC commentary for the 2026 World Cup. Because of this, speculation spread online that **"he might have taken GLP-1 injections like Ozempic/Mounjaro."** However, on September 25, during This Morning, Rooney personally stated, **"Everyone says I use that pen, but I don't."** He explained that it is the result of quitting alcohol, improving his eating habits, and exercising hard.
Furthermore, if the meme you are referring to is the famous one that juxtaposes a photo of Rooney looking extremely old and fat with a recent slim photo, you should be even more cautious. That "fat and old-looking" 2024 photo has been fact-checked as a manipulated image that exaggerated his face and hair. The difference is clear when compared to the original stadium photos.
Conclusion:
Slimmer Rooney = Real / Mounjaro use = Denied by Rooney himself / Famous meme showing him looking morbidly obese = Manipulated.