Trent Alexander-Arnold starred for Liverpool as the Reds defeated fierce rivals Man United 3-0 at Old Trafford. Alexander-Arnold had a goal disallowed early in the Premier League clash, as Luis Diaz netted a brace and Mohamed Salah added a third. Jamie Carragher praised Salah after his display, which helped fire Liverpool to joint-top of the Premier League table. It was Arne Slot’s first major test as Liverpool manager, and the Dutchman certainly didn’t disappoint at Old Trafford. His counterpart Erik ten Hag meanwhile will have questions to answer after his side’s performance on home soil. St…