Former Liverpool and Roma defender John Arne Riise has identified one key match up ahead of next week's Champions League semifinal.

Liverpool are in Rome for the first-leg on Tuesday night and Riise believes the game could be decided by Mohamed Salah's clash with Roma defender Aleksandar Kolarov.

He told Leggo: "You cannot leave Salah half a yard, honestly I did not think he could be so devastating and now he's in an incredible moment. On his side, however, there is Kolarov, in my opinion one of the best full-backs in the world, although I would like to see him be more aggressive."

Riise added: "Roma and Liverpool are equal. (Eusebio) Di Francesco's team is more experienced and solid, (Jurgen) Klopp's more technical and spectacular.

"I expect many goals and uncertainty until the last minute."