The £32million Brazilian superstar has been using the public transport system to take his girlfriend on shopping trips.
Other passengers could not believe it when they saw the pair board a double decker in the centre of Manchester.
Robinho, who earns £140,000 a week, stumped up £6 for two tickets on the five-mile journey to the out-of-town Trafford Shopping Centre.
One traveller told The Sun: “He sat downstairs as if it was the most normal thing for a multi-millionaire footballer to do. Word quickly went round about who he was. Nobody quite believed it and some just stared open-mouthed.
“You’d think Robinho would have a fleet of luxury motors like so many other Premier League players.
“At the very least you’d expect him to be driven by a chauffeur or maybe, at a push, pay for a taxi. But a bus? Amazing!”
He and his girlfriend are thought to have caught another bus later in the day back to the five-star hotel where he is staying.