Unai Emery warned Arsenal to expect a strong response from Napoli after his side seized the initiative with a 2-0 win in their Europa League quarter-final first leg on Thursday.

Emery's men took control of the tie with a dominant first-half performance at the Emirates Stadium. Aaron Ramsey opened the scoring with a cool finish to cap a flowing move and the Gunners were further ahead before half-time when Napoli defender Kalidou Koulibaly deflected Lucas Torreira's shot into his own net.