Mainoo told manutd.com: "They are my boys! We are all young, so we are almost always together. We talk all the time and do everything else.
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"I have known Garna (Garnacho) since we were at the academy. We both made our debut for the U18 team at the same time against City. It was then that he didn't speak English, so we didn't know him that well.
"But we have developed a really good relationship, all three of us, and it will hopefully continue in the future."