Liverpool are in the market for a new long-term left-back, with Benfica defender Alvaro Carreras emerging as an option for the Reds. Carreras has been linked with a move to Liverpool in recent days with the former Manchester United fullback attracting some big-name suitors after an impressive year with Benfica, with the 21-year-old moving to Portugal on a permanent basis in the summer. Noted by Breaking The Lines as a ‘brilliant’ defender when it comes to making space for his teammates, Carreras has all the makings of becoming the next great left-back in European football, with Liverpool inter…