Liverpool boss Jurgen Klopp has hailed Unai Emery's impact at Arsenal, saying the Spaniard inherited a tough task after what felt like "50 years" of Arsene Wenger's stewardship.
Klopp and Emery are set to lock horns when their sides meet in the Premier League on Saturday.
Liverpool head into the match second in the table and four points above their fourth-placed opponents, who are on a 13-match unbeaten run under Emery's guidance.
Emery succeeded legendary Arsenal boss Wenger at the Emirates Stadium in the summer and Klopp has praised the ex-Sevilla boss for making a strong impression at the club.