Midfielder Denilson knows Arsenal will have to be at their best when they tackle league leaders Chelsea on Sunday. Gunners boss Arsene Wenger hit out at his side after their 1-0 defeat by Sunderland at the Stadium of Light last weekend, a result which leaves them five points adrift of the Blues, albeit with a game in hand.
The North London side bounced back from that disappointment with a 2-0 success against Standard Liege on Tuesday which secured their place in the last 16 of the UEFA Champions League.
Denilson marked his return from a two-month spell on the sidelines with a back injury with a spectacular strike against the Belgians.
"I am very happy at the moment. Not only me but also all the group is very happy," he told the club's official website.
"On Sunday we have a hard game against Chelsea, a big team, so every game we have to focus."
He added: "Two months out was very difficult but I am back now so I have to play well in all the matches."