Mosquera, formerly of Valencia, played with Yamal for Spain's youth teams.
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He said of 15 year-old Dowman: "I don't mean to compare, but his style and way of playing is like Lamine Yamal. His movements are Lamine-esque.
"I didn't have him on my radar and when I got to Singapore, he was already training and playing.
"When they told me he was 15, I couldn't believe it. He really is an incredible player, and I think he's going to be world-class."