What to look out for in the Europa League semifinal second legs

Leverkusen are in pole position against Roma but guarding against complacency, while it is all to play for in Bergamo where Atalanta host Marseille.

Leverkusen's Florian Wirtz, Roma's Romelu Lukaku, Atalanta's Gianluca Scamacca and Marseille's Pierre-Emerick Aubameyang

Can anyone halt the Leverkusen juggernaut? Themselves, perhaps, or Roma's attacking strength. Atalanta and Marseille are blessed with that too, primarily in the shape of two in-form strikers determined to make a difference.

In this piece presented by Enterprise Rent-A-Car, we pick out some key talking points ahead of the semifinal deciders. Remember: Every mission matters.

Leverkusen unstoppable

"This is Leverkusen's year," Roma coach Daniele De Rossi conceded after the new German champions' 2-0 first-leg win in Italy. "They won the Bundesliga; they don't just have quality, but also a great deal of physicality and stamina." How do you stop a juggernaut? You don't; you hope it stops itself. Yet after a couple of weekends when their unbeaten record came under serious threat since clinching their maiden German title, Xabi Alonso's charges are back doing what they do best.

In a season of firsts, Leverkusen recorded their first win in ten matches against Italian teams (D2 L7) in Rome and a first Uefa Europa League final appearance beckons (though they did win the Uefa Cup in 1988). "We don't want to stop," said Alonso. "We want to go on like this until the end of the season." Lothar Matthäus extended De Rossi's sentiment when he labelled Leverkusen "champions ready " and it is hard to disagree.

De Rossi demands perfection

Roma have struggled in front of goal in recent weeks, scoring just 11 in their past 11 matches. Not for want of trying, and the first leg may