One of Arsenal’s most important players could’ve easily been playing for Manchester United right now. Mikel Arteta has built a terrific squad at the Emirates. He has a number of incredible players at his disposal, which is why his side have been in the Premier League title race for two seasons in a row. One Arsenal player who was signed by Unai Emery in 2019 had caught many clubs’ eye when he was still a kid. He had a bunch of trials as well. Manchester United invited him twice to train with the youth sides, but on both occasions, they sent him back. He is now a key player for Arsenal. Arsenal…