Change is a good thing, but too much change makes a team unrecognisable.
In an interview with The Express, Andre Schurrle rang alarm bells for Manchester United fans earlier this week by stating: "He [Mourinho] will probably buy a lot of players that suit him and how he wants to play.'
The former Chelsea striker endured a difficult time under Jose Mourinho and cited a lack of game time as the reason behind his move to Wolfsburg.
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His words flag concerns for United fans, who will begin to expect an influx of Mourinho-style players at the expense of the regular team.
While a significant number of the squad underperformed last season - whether due to their own form or Louis van Gaal's tactics - it is uncomfortable to picture a completely new team. Too many new players will mean the club loses its identity, something United came worryingly close to in the possession-centred dullness of the Van Gaal reign.
In the glory days, United had a core of players guaranteed to appear on the team sheet. Of course, the squad was rotated based on injury, form and in the interests of depth, but it felt like most players were a permanent fixture, with only one or two new names to learn each season.
United fans have welcomed many new players over the last two years and getting to know them now seems futile, despite the fact that Mourinho has reportedly sent a message to all players confirming that they will get their chance to impress.
So far, only one target has been confirmed: the £30 million Eric Bailly. The Henrikh Mkhitaryan deal looks to be confirmed any day now, but many more faces are expected to follow.
As the Euros take centre stage, the rumour mill continues to churn with the gossip columns linking United with big names such as Gareth Bale, Cristiano Ronaldo and Paul Pogba, and in-form talents such as N'Golo Kante, Julian Draxler and Riyad Mahrez.
If Mourinho recruits in big numbers as Schurrle suggests, and with David de Gea and Wayne Rooney the only ones who appear to be safe, United will be dishing out squad numbers next season like never before.
With a new management team, no Giggs and a host of new players, the Old Trafford faithful will barely recognise the club by August.