"They are really good," Klopp said of Brentford. "The goalkeeper could have the No. 10 shirt. He played a few incredible balls."
An overhand right from the Liverpudlian midway through the second round caught Castillo flush on the temple.
Lille have won every single Ligue 1 game in which their Canadian star Jonathan David has found the net, a remarkable record that continued on Saturday as his brace secured a 2-1 victory at Strasbourg.