Jurgen Klopp has called on Liverpool fans to show Roma "the respect they deserve" when the teams meet in Tuesday's Champions League semi-final first leg.
Merseyside Police have vowed to crack down on any troublemakers to avoid a repeat of the incidents before the clash with Manchester City in the quarter-finals, when missiles were thrown from within a crowd of Reds supporters at the visitors' team bus as it made its way to Anfield.
Klopp does not want Roma to receive the same welcome and has urged fans to show their opponents the positive side of their "fantastic" support.