UEFA Technical Observer Anna Signeul highlights how the second-half introduction of Barcelona substitute Clàudia Pina proved crucial in her side's 4-1 victory over Chelsea in the first leg of their UEFA Women's Champions League semi-final.

Barcelona recovered from a missed penalty by Alexia Putellas to take a commanding 4-1 lead over Chelsea in the Women’s Champions league semifinals on Sunday.

Extending their Champions League winning streak to eight matches, Barcelona have now won 28 of their last 30 home games in the competition. Meanwhile, Chelsea suffered their first defeat in six UCL ma