Younger brother of Atlético Madrid club-mate Lucas, Theo Hernández has been catching the eye with his fleet-footed performances while on loan at Alavés. Both Barcelona and Real Madrid are said to be keeping tabs on the 19-year-old Rojiblancos left-back. Here's why.Name: Theo HernándezClub: Alavés (on loan from Atlético Madrid)Debut: 28 August 2016 v Sporting Gijón (Liga)Position: defenderNationality: FrenchBorn: 6 October 1997Preferred foot: leftHeight: 184cm