Liverpool first broke the transfer record by bringing in Alisson Becker from AS Roma, but Chelsea made a decision to go one step better by signing young Athletic Bilbao shot-stopper Kepa Arrizabalaga.
Asking for a full explanation, the statement said: "We do not believe in spending money or signing players for the sake of it".
In the end they did enough to survive, finishing four points above the drop zone in 16th but a repeat effort this season may be too much for Aaron Mooy's side.
Tottenham Hotspurs was the only team in the league to not have signed any player in the current transfer window.More news: Samsung launches the Galaxy Note9 with 6.4-inch screen
Mourinho had asked the club management to sign a defender after most of his defenders picked up injuries during their pre-season tour and Jerome Boateng who Bayern Munich was ready to listen to any offer for, became United's target.
Real Madrid was already pursuing the Belgium goalkeeper before striking the 35 million euro fee with Chelsea.
"You are talking about Liverpool spending money this transfer window, City have spent bad lot in the last few years and they are now getting the benefit under Pep Guardiola".
Surprisingly, newly-promoted Fulham was third on the highest spenders' list with 105.3 million euros spent on seven players.More news: Justin Bieber Opens Up About Crying With Hailey Baldwin
However, retaining or even improving on last season will be hard, especially if they qualify for the Europa League group stages as matches on Thursday nights will be hard to manage.
The Leicester City defender made his mark for the Three Lions at the Russian Federation 2018 World Cup, scored his first worldwide goal and was the brain behind Gareth Southgate's solid defence line during the World Cup.
The 25-year-old is arguably the continent's best out-and-out striker, and he is most definitely Spurs' most important player.More news: Manchester United wins Premier League opener with Pogba goal