As the Champions League reaches its crucial stages, find out who is involved, when the semi-finals are happening and how to watch

The UEFA Women's Champions League semifinal round will kick off on Saturday with the final four clubs representing three different countries. Arsenal will face Lyon, while current title holders Barcelona will host Chelsea on Sunday.

When is it? How can you watch it? What are the starting line-ups? All you need to know about the UEFA Women's Champions League semi-final first leg between Barcelona and Chelsea.