"He has had some good games but because the team was playing really well this could be his best game so far," said Benitez.
"I thought he started really well against Manchester United in his first game and he has scored some good goals for us.
"Riera has quality but he has to be more consistent. Clearly he is a player with ability and he can score great goals.
"When he is playing well he can beat anyone so that is what you always expect from a winger. He is playing with confidence."