That should change this season with Morata poised to replace Costa as Chelsea's figurehead, but how he will cope with the pressure of being his side's primary source of goals remains to be seen.
Defenders Benjamin Mendy, Kyle Walker and Danilo have all arrived at the Etihad Stadium along with goalkeeper Ederson and midfielder Bernardo Silva to take City's expenditure to £217 million ($281 million, 238 million euros).
City also look stronger on paper.
"I'm here to score goals and be the focal point of the team", Lukaku said. "It's obviously more hard to win the Champions League, also because the motivation is higher".
"In my other clubs it was more people scoring goals, midfield players, wingers, central defenders in the air scoring goals from set-pieces".
After impressing in the Reserves and youth ranks, Mitchell was rewarded with his first-team debut on the final day of last season when he started in the win over Crystal Palace.
Chelsea and Manchester United have both put their faith in big-money strikers as they bid to win the Premier League title this season.
"I don't think I am going to win it because I always win it in the second season. The reality is totally different", he told ESPN.
He thinks he can do more.
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Premier League relegation battle - Who will go down?
"For example, hopefully next season I will be here and we are not going to spend how we spent this season". We put our bodies in we made some important tackles and eventually we got the goal because we were patient.
Indisputably, N'Golo Kante enters the 2017-18 Premier League season as the best defensive midfielder/central midfielder. There are only a few players that can do what he can.
"He's injured. He needs time to recover", United manager Jose Mourinho said on Friday.
Playing three at the back may enable Guardiola to associate Aguero and Jesus in attack, after he generally used a single-striker system last season following Jesus's arrival in January.
Mourinho admits it was a challenge to keep his players fired up to compete for Europe's secondary competition but he does not expect any problems this year.
Most popular: Tottenham Hotspur: Is Mauricio Pochettino's Spurs Team Now a Selling Club?
Fourth last season, Liverpool have signed relatively modestly, adding Mohamed Salah, Dominic Solanke and Andrew Robertson to their ranks.
English football underwent a major transformation 25 years ago this month with the advent of its breakaway top flight - one that would morph into a multi-billion pound industry with a global reach.
Perhaps the most enticing question is over how he will use his attack, and whether he will let Romelu Lukaku and Rashford wreak havoc together up front, and whether he will play more of his more creative attackers - like Anthony Martial and Henrikh Mkhitaryan - behind them rather than always having more of a worker like Jesse Lingard.