The presence of the Swede in the dressing room, at training sessions and on the pitch will bring that title winning experience that many of his teammates don't have. Brazilian Ederson is believed to be the answer to their goalkeeping troubles and Portugal's Bernardo Silva is a classy addition to the midfield.
It has been another strong showing of City's financial muscle but Guardiola insists the club have only paid market rates and such major rebuilding work is a one-off.
He said: "We have a giant on our chest which is really heavy, but we don't compare to the biggest clubs in Europe right now".
"Given the transfers, I think what you do is you try to assess nearly a middle market".
"It's hard to explain, but when you play with Mourinho, you feel like the best striker in the world".
We have a few youngsters on the fringes of the first team who have shown this summer that they can do a job when called upon.
"But he's also very humble about himself, he's also still learning the country and Premier League, and hence that's why he's brought in the level of players he has".
"We had lots of dominance at home, lots of chances, lots (of times) when the match should be two or three nil and in the end was 1-1".
Liverpool's hopes hinge on hanging on to attacking ace Philippe Coutinho, with Barcelona desperate to sign him after selling fellow Brazilian Neymar to Paris St-Germain for a world record $326 million.
Belgian striker Romelu Lukaku followed Swedish center-back Victor Lindelof was followed to Old Trafford, and Nemanja Matic was reunited with Mourinho from Chelsea. I don't say the league because I have been in this league a long time. We spent, of course, but all the teams spent - except maybe Tottenham.
"We were focused on the striker getting goals and when it didn't happen we were in trouble".
One to watch: Alexandre Lacazette - Arsenal fans have been crying out for the club to invest in a world class striker and the Frenchman's big-money arrival from Lyon ticks that box.
Guardiola believes the Neymar deal has over-inflated the market to levels that can not be maintained. But I think Mourinho is a good coach and there is no doubt about that, because he has won everything he has been through.
Chelsea will open their league campaign with a home game at Stamford Bridge against Burnley on Saturday.
The Premier League gets underway on Friday and Chelsea return as the defending champions after lifting the trophy last season.
The gaffer: Arsene Wenger - Entering his 22nd season as Gunners boss, the Frenchman has everything and nothing to prove at the Emirates depending on who you talk to. If pre-season is anything to go by Anthony Martial and Henrikh Mkhitaryan are full of confidence and if that transpires into the regular season opposition teams will have every right to be anxious. "It will not be easy but we travel to win the game".