Talking points: Can stingy hosts stop Liverpool’s attack?

Here’s four major talking points ahead of tonight’s Champions League semi-final clash.

Chances of lightning striking twice?

Roma have already produced one remarkable comeback in this season’s competition, having overcome a 4-1 first-leg deficit to knock Barcelona out with a 3-0 home win in the last round. A “cut and paste”, as manager Eusebio di Francesco described it, would, be enough for them to progress on away goals.