Arsenal's Nicolas Pepe celebrates scoring their first goal with Gabriel Martinelli and Emile Smith Rowe during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. Slavia Prague boosted their hopes of a first European semi-final since 1996 as Tomas Holes headed a stoppage-time equaliser in a 1-1 draw at Arsenal in the first leg of their Europa League quarter-final. REUTERS/Dylan Martinez

Arsenal's Nicolas Pepe scores their first goal during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. REUTERS/Dylan Martinez

Arsenal's Alexandre Lacazette in action with Slavia Prague's Tomas Holes, Alexander Bah and Ondrej Kolar during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. REUTERS/Dylan Martinez

Arsenal's Bernd Leno in action during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. REUTERS/Dylan Martinez

Slavia Prague's Tomas Holes scores their first goal during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. REUTERS/Dylan Martinez

Slavia Prague's Tomas Holes celebrates scoring their first goal with Jan Boril during the match Europa League Quarter Final First Leg between Arsenal vs Slavia Prague at Emirates Stadium, London, Britain, April 8, 2021. REUTERS/Dylan Martinez