The pair shook hands on the pavement before the fan seemed to launch into a tirade of tips for the former Manchester United manager.
The casually-dressed Special One, 55, looked somewhat taken aback by the passer-by's pearls of wisdom, but had a wry smile across his face when he walked off after their exchange.
Mourinho is readjusting to life without a job after being sacked by United last month.
He is understood to be living in his West London home and is back in the capital after returning to Portugal over the Christmas season.
He famously spent the entirety of his two-and-a-half-year spell in charge at Old Trafford living in the Lowry Hotel.
Mourinho's former side take on Reading in the FA Cup Third Round this lunchtime with two flops of his flops will start at Old Trafford.
Interim boss Ole Gunnar Solskjaer confirmed Alexis Sanchez and Romelu Lukaku will both start the game.
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Lukaku came off the bench in the wins over Bournemouth and Newcastle to score but is set to lead the line from the outset today.
Sanchez, meanwhile, has not started a game since United beat Juventus in the Champions League two months ago.
He made his first appearance under Solskjaer on Wednesday, coming on for the final half-hour at St James' Park.
But United are without Paul Pogba who is ruled out with a leg injury following Jonjo Shelvey's shocking tackle this week.
Shelvey escaped any punishment from the FA despite raking his studs down the back of Pogba's leg, which sparked an understandably angry reaction from the Frenchman.
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