Manchester City striker Sergio Aguero suffered an injury on Saturday in the 2-1 Premier League win over Chelsea.
According to Jamie Jackson of the Guardian, Pep Guardiola said the injury was "not good" after the forward limped off after 77 minutes.
Aguero was a constant threat against the Blues and hit the woodwork before his night ended prematurely.
The 31-year-old is the club's all-time leading scorer and has been the main man in attack since his arrival in 2011. Even with the talented Gabriel Jesus waiting in the wings, Aguero has kept his spot in the starting XI thanks to his steady supply of goals.