The former Arsenal man believes there is only one big difference between the two sides, despite what the table might show.
Jose Mourinho’s side have run away with the league this season in the Portuguese manager’s second year in charge since his return, while City have been hugely disappointing in their title defence.
That has naturally led to many comparisons between the two sides and analysis into how Manuel Pellegrini’s side will have to change in the future if they wish to challenge again.
Merson, though, says the main difference between the two sides is one basic thing; concentration.
“The biggest thing between Manchester City and Chelsea is concentration,” he said.
“Chelsea don’t take liberties with smaller teams, and that is the be all and end all. There’s been a few games they’ve lost that Chelsea don’t and they mount up in the end. “
It is an interesting point when it comes to players, with City having spent heavily for many years now but very few of their signings seeming to have come off. Pellegrini’s signings in particular have come in for criticism, with Eliaquim Mangala having endured much of the critique.
In contrast, Jose Mourinho’s signings since re-joining Chelsea have been lauded as successes, even though players such as full-back Filipe Luis and Juan Cuadrado are yet to wholly impress at Stamford Bridge.
Merson though, despite saying the squads aren’t too far apart, says City will need to invest at centre-half once again this summer.
“Player wise, there’s not much difference,” he added.
“Probably the weakest position is the second centre-half. Chelsea have got two very good centre-halves, Manchester City have got one and that is it.”