One Portugal star, currently representing the nation at Euro 2024, had the opportunity to join Arsenal in 2019. Arsenal were certainly busy in the transfer window during the Unai Emery era. There were some success stories in this time, as the likes of Gabriel Martinelli and William Saliba were brought to the club. However, far too many of the arrivals from this period turned out to be flops. Nicolas Pepe, Lucas Torreira, and Matteo Guendouzi, amongst others, all ultimately failed to make the grade at the Emirates Stadium. There is, however, one target that the Gunners missed out on in 2019 who…