Questions & Answers about Eu disse obrigado.
Yes, you often can leave it out in Portuguese.
Portuguese usually allows the subject pronoun to be omitted when the verb form already makes the subject clear. Since disse means I said, eu is not strictly necessary.
- Eu disse obrigado. = I said thank you.
- Disse obrigado. = also I said thank you.
Including eu can add emphasis, contrast, or clarity.