In 2017 Chile fans signed a petition and organised a protest march to force Sanchez to quit Arsenal for a better club, and it got into his head and he got stroppy to push for the transfer. He was very brilliant for both club and country until then.The environment became toxic after Sanchez signing not before it, so he was a big part of such toxic environment anyway. This isn't an excuse for him.
Edit : It also was turning really toxic in his last days with Arsenal before joining us. The guy is just a big part of it. He wasn't hindered by such environment.
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