An Aaron Ramsey strike and a Kalidou Koulibaly own goal gave Arsenal a 2-0 victory over Napoli in the first leg of their Europa League quarter-final, while Chelsea beat a stubborn Slavia Prague 1-0.
Valverde said he was concerned about the team's away form after they were comprehensively beaten 2-0 by promoted Granada
A summary of Saturday's matches in the English Premier League.
Images from the UEFA Champions League matches played across Europe on Wednesday