Pre-season for Premier League clubs is mainly about players rediscovering their peak fitness levels in time for the new campaign. It is, however, also very useful for discovering talent within the squad that may come in handy.
See Trevoh Chalobah last year, for example. Thomas Tuchel had no real plans of using the Chelsea defender for the 2021/22 term but his performances in pre-season convinced the Blues head coach to keep him. Look how that went.
This time around, there are plenty of other names who are in a similar boat to what Chalobah was sailing last year. Levi Colwill, Emerson Palmieri, Kenedy – that's to name a few.