And though Manchester United's Premier League woes back that claim, their record in other competitions contradicts it.
The Red Devils won a second major trophy of the season at Ajax's expense last night, with Paul Pogba and Henrikh Mkhitaryan inspiring them to the Europa League.
It means that, despite finishing sixth in the league, they will be joining the European elite in the Champions League next term.
And the success also shames fierce rivals Arsenal, Liverpool and Tottenham.
Since Ferguson's retirement, United have now won three pieces of major silverware.
Manchester United player ratings from Europa League final Wed, May 24, 2017
Express Sport brings you Manchester United's player ratings from the Europa League final against Ajax
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Sergio Romero – 7.2
Manchester United won the Europa League after a 2-0 win over Ajax last night
Much-maligned former manager Louis van Gaal won them the FA Cup last season, while Mourinho has added to that with two cup triumphs of his own.
The win means that they have now won the same amount of trophies in the past four years as Chelsea and Manchester City.
Though if you include the Community Shield – and Mourinho and surely David Moyes do too – they have five. No other team has more.
But when it comes to the bigger competitions, Chelsea have won two Premier League titles in the past three years, and also won the EFL Cup under Mourinho's tutelage in 2015.
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And City have also achieved the same, winning one league crown and also earning two EFL Cup success'.
However, Arsenal and Liverpool are still trailing despite United's fall from grace.
Jose Mourinho has won two major trophies at Manchester United this season
The Gunners won the FA Cup in 2014 and 2015, beating Hull and Aston Villa in both finals.
But manager Arsene Wenger has been unable to add to that collection – something supporters have found infuriating as he continues to cling on to his job.
Liverpool and Tottenham, meanwhile, have won nothing for quite some time.
The Reds last won a competition back in 2012, in the form of the EFL Cup, when Kenny Dalglish was in charge and Stewart Downing was voted man of the match.
And Tottenham are still waiting on their first piece of silverware in nine years, back when Juande Ramos was at the helm.