Fulham signalled its determination to stay in the English Premier League by becoming the first promoted team to spend over £100-million ($167.7-million) in the summer-transfer window.
The only addition to the north London club is a new stadium and even that will not be ready for the first month at least.
Pochettino's belief is strengthened by Tottenham's success in persuading a number of key players, including England striker Harry Kane - the World Cup golden boot victor - to sign new contracts.
Yet, United could end up facing one of Mourinho's top targets in Harry Maguire at Old Trafford, with Leicester reportedly holding out for a world-record fee for a defender to land one of England's heroes from a run to the World Cup semi-finals. Little more than four months after Manchester City won the 2017-2018 Premier League title, the league returns in full this weekend with 10 matches spread out from Friday afternoon until Sunday, with the piece de resistance taking place Sunday morning, when the reigning champions visit Arsenal.
United claimed a 2-1 victory over Leicester City in their Premier League opener and Mourinho continued to lament the lack of summer spending from those above him.
As for the rest, Brighton and Huddersfield Town may well find it a long, hard season and struggle to punch above their weight like they did last time.
"Our targets are always in the same level of Real Madrid or Manchester United or Manchester City, but for different circumstances we can not achieve that", Pochettino said before the match to explain the club's transfer inactivity.
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The club's owners have close links to super agent Jorge Mendes, who counts Cristiano Ronaldo as one of his clients, and a number of his players now turn out for the east Midlands side.
There was barely a save to make for Kepa Arrizabalaga, who became the world's most expensive goalkeeper when he joined Chelsea for 80 million euros ($93 million) from Athletic Bilbao earlier in the week.
But the last day of the window belonged to Everton, who made a triple swoop for Chelsea's Kurt Zouma, Bernard, Yerry Mina and Andre Gomes from Barcelona, with Arsenal's Lucas Perez signing for West Ham.
Although there has been speculation about a deal for Tottenham's Toby Alderweireld, there has been no offer from United while Leicester remain determined to retain England global Harry Maguire, who has four years left on his contract.
Fresh from last season's record points and goal haul, Sane accepts that winning back to back Premier League titles will be a tough ask, but under Pep Guardiola, he and City are improving, and determined to continue their extraordinary level.
One game into the season and we've already had two collectors' items - a Luke Shaw goal and a happy Jose.