Real Madrid star Cristiano Ronaldo has paid tribute on Twitter to Esuebio, posting a photograph of the pair together.
The 71-year-old is reported to have died following a cardiac arrest.
More top news
The Islamic centre where the Manchester suicide bomber is thought to have prayed says the attack "has no place in Islam or any religion".
German chancellor Angela Merkel and Indian prime minister Narendra Modi among those to praise "great spirit" of Manchester people.
The bomber's identity has been confirmed by Greater Manchester Police.