Arsenal boss Mikel Arteta said his relationship with Manchester City manager Pep Guardiola "had to change" with the two clubs battling for the Premier League title.
The two sides face off at the Etihad on Sunday with just one point separating third-placed City from leaders Arsenal.
Arteta served as Guardiola's assistant for three-and-a-half years at City before taking his first managerial job at the Emirates in 2019.
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