Jo Ramirez, McLaren's former long-time team manager, has slammed fellow Mexican Sergio Perez.
McLaren ousted Perez, 24, after a single season at the end of last year in favour of Danish rookie Kevin Magnussen.
"As a driver Sergio was actually not bad (at McLaren)," Ramirez, a former advisor to Perez, told motorline.cc. "I think he was also getting better.
"Sergio was just not good enough as a person. He didn't really cooperate with the team, he was too cocky. His attitude was very bad," he claimed.
"He was unpopular with the engineers, with everyone. I often criticise him in the media, but I do not criticise him as a driver. He's a good driver.
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