Alisson on Klopp - "He is the foundation of our team"
Alisson hails Jurgen Klopp's impact at Liverpool as the Brazilian admits that signing for the Reds was "a huge challenge". Watch the team's second leg at Villarreal from 7pm on BT Sport 2 HD and Ultimate.
Get BT Sport today - contract free
Watch BT Sport's unbeatable line-up of world-class live sport for just £25 a month
