Arsenal have reportedly set their sights on a Brazilian teenager who has a “technical” yet tough style on the pitch. The Gunners famously struck gold when they signed Gabriel Martinelli from Brazil in 2019, and they’re always open to pulling off a similar transfer masterstroke. According to Football Transfers, Arsenal are now showing interest in on-loan Red Bull Bragantino defender Douglas Mendes. The report claims Gunners chief Edu is an admirer of the 19-year-old, who is on the books at Red Bull Salzburg. Mendes made his debut in Brazil’s Serie B with Ponte Preta before moving to the Red Bul…