Metta World Peace had a rough start to his pro basketball career in China -- telling TMZ Sports he got pretty sick right when he got to town ... and spent 3 days in a Chinese hospital.
Metta -- who inked a deal with the Sichuan Blue Whales back in August -- said he fell ill on day 1 of his international career ... and doctors hooked him up with IVs to help him recover.
Peace says the experience was A LOT different from the American hospitals he was used to -- but says the fans were very supportive.
Now, the 35-year-old says he's completely recovered and healthy enough to focus on an NBA comeback ... and looks forward to "dominating" again real soon.
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