Leverkusen have confirmed that playmaker Heung-Min Son is a doubt for the second leg of their Champions League qualifier against Lazio.
Die Werkself welcome the Biancocelesti to the BayArena on Wednesday evening looking to overturn a 1-0 deficit from the first leg.
Both sides look set to be missing key players for the clash, though, as Miroslav Klose and Lucas Biglia are ruled out for the visitors.
But Son now seems likely to be sidelined himself having missed Leverkusen's final training session on Tuesday afternoon.
The South Korea international missed the Bundesliga fixture against Hannover 96 on Saturday after picking up an infection against Lazio in Rome last week.