Xavi is expected to return for Barcelona
Schalke striker Klaas-Jan Huntelaar will miss second leg Champions League tie against Galatasaray because of a knee injury.
Tuesday's Champions League fixtures:
Barcelona v AC Milan (agg 0-2)
Schalke 04 v Galatasaray (agg 1-1)
All kick-off times 19:45 GMT unless otherwise stated