Barcelona will go for its third straight Women's Champions League title with a squad boosted by Poland's star striker Ewa Pajor and with Aitana Bonmatí and Alexia Putellas playing on new contracts. The group stage of the European club competition begins Tuesday and the Catalans are trying to become only the second team after Lyon to win three titles in a row or reach five straight finals.

The Catalans have won back-to-back European titles but only Lyon have ever done a three-peat. Who are the biggest contenders for this season's trophy?