Manchester United's recent capture of Borussia Dortmund winger Jadon Sancho will have left somewhat of a sour taste for those connected with Manchester City.
The 21-year-old was previously an academy player for the Citizens, before completing an £8m Bundesliga move in 2017.
Since then, Sancho has dramatically raised his profile to become one of Europe's brightest talents.
The England international recently completed a £73million move to City's bitter rivals to leave a lingering sense of 'What if'?
And Sancho is not the only example of a player to have proven their worth away from the Etihad.
Daily Star Sport have taken a look at the other stars who have enjoyed successful careers after seizing opportunities elsewhere…
A transfer decision City may live to regret.
Brahim Diaz began to feature in Pep Guardiola's side during the 2017/18 season, making a total of ten appearances in all competitions.
The following campaign, Diaz scored both goals as City defeated Fulham in the Fourth Round of the EFL Cup.
By this point, his talent was being recognised.
Real Madrid secured the services of Diaz for £15.5million in January 2019 and has already been made more first-team appearances than Martin Odegaard, who signed back in 2015.
The 21-year-old enjoyed a successful loan spell at AC Milan last term and will spent the next two seasons with the Serie A giants.
Which player should City have given more of a chance to? Comment below.
Rony Lopes joined City's academy in 2011 and made his first-team debut for the club in the 2012/13 season.
The Portuguese midfielder made a further four appearances the following campaign before being sold to Monaco for £9million.
Lopes scored a staggering 17 goals in all competitions during his first season at the club, as well as registering 12 assists.
He later signed for Sevilla in 2019 on a five-year deal and spent last season on loan at Nice.
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Denayer failed to make a single first-team appearance for Man City, despite remaining on the club's books for four years.
After a series of loan spells, the Belgium defender completed a permanent move to Lyon in 2018.
The 26-year-old has been a regular presence in the team for the Ligue 1 outfit and offered City a timely reminder of his quality during the 2019/20 season.
Denayer helped Lyon achieve a shock 3-1 Champions League quarter-final victory over the Sky Blues, in what was a heroic performance from the French side.
Brooks was associated with the City academy from the age of seven and spent ten years at the club.
He joined Sheffield United's youth set-up in 2014 and broke into the first-team one year later.
Brooks earned a move to Bournemouth in 2018 and quickly made a positive impression in the Premier League.
The Welsh winger cruelly missed most of the 2019/20 season through injury but looks set for a bright future.
Trippier was involved in the City set-up from the age of nine, joining the club in 1999.
The full-back ended up forging a career away from the Sky Blues, having impressed during loan spells at Barnsley and Burnley.
Burnley took a chance on Trippier in 2012 on a permanent basis and enabled the England international to develop into a well-rounded player.
He impressed at his next club Tottenham Hotspur, though silverware evaded him during his four years in north London.
Many were surprised to see the 30-year-old join Atletico Madrid in 2019, but Trippier helped the Spanish side to the La Liga title last campaign in extraordinary style.
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