Manuel Pellegrini believes Jose Mourinho can bring the trophies to Tottenham that eluded Mauricio Pochettino.
But the West Ham boss reckons any success is likely come at a cost, with Spurs fans predicted to be thinking about "what kind of football you want" sooner or later.
The Mourinho era with Spurs begins at 12.30pm on Saturday with a London Stadium derby between two sides in desperate form.
Tottenham jettisoned Pochettino on Tuesday night while the Hammers are sticking with Pellegrini - for now.
It is no secret that Mourinho and Pellegrini view each other with contempt even though both are ex-Real Madrid managers who have won the Premier League as well.
Mourinho taunted Pellegrini for joining mid-level Malaga on leaving Madrid, who sacked him in 2010 to make way for the Special One.
Pellegrini, who insisted not being Mourinho's friend does not make him his enemy, prides himself on producing attacking teams that don't 'park the bus'.
And he reckons there could soon be plenty of the latter at the new-look White Hart Lane.
He said: "Jose Mourinho, in every league where he works, in Italy, in Spain, here in England, he is a manager that has a lot of titles behind him so he will be a manager who is good for football. After that you must think of what kind of football you want.
"Of course the philosophy of Pochettino is not the same as the philosophy of Mourinho, but he's just in charge of the team in two days so I don't think he will try to change all properly."
Pellegrini said he was surprised Pochettino was given the boot so soon after leading his team to the Champions League final.
But something similar had happened to other big-name managers in the past - including Mourinho.
He said: "You saw what happened with Chelsea when Mourinho was manager. They won the title then the next season he was sacked. After that, Leicester , exactly the same, (Claudio) Ranieri was sacked."
Mourinho, in his last days as a TV pundit, had chided Vincent Kompany for not thanking him for helping City win the 2015 title under Pellegrini.
That alluded to Chelsea's 2-0 win at Liverpool , City's only rivals for the prize, where Steven Gerrard famously slipped to allow Demba Ba to score.
But Pellegrini wasn't willing to give Mourinho any credit whatsoever.
He said: "Lots of people said we won that title because one player of Liverpool made a slip and conceded a goal.
“Maybe I am wrong but I think we won that title by two points that season and Liverpool lost that game 2-0, not 1-0. If they had drawn without that goal we would still have won by one point.
“Every team that beat Liverpool in that season, maybe it was good for us. Every team that beat Manchester City that season it was good for Liverpool. But you can’t be talking about one manager or one action during 38 games.”