Each of the Premier League's 20 clubs have someone they probably cannot do without if objectives for the season are to be met.
For Manchester City, that's Raheem Sterling. Pep Guardiola's frequent reshaping of his team means nobody is truly indispensable, with Sergio Aguero in particular given that message. Sterling, though, has been a model of consistency from the flanks.
To see who is crucial to other Premier League clubs' success, click here.