"It feels quite special because you know a lot more about the other team than you would usually know," said Klopp.
"You are more interested in the other team than you are usually. I'm pretty sure Mo has followed the whole of Roma's season.
"He had a fantastic time there and became the player we have now, big credit to the staff and players at Roma because they were all part of his development.
"We are all professionals though. I am sure Italian defenders are famous for not having friendly games. Mo will feel pretty early in the game that they are not his team-mates anymore."