They are currently fifth, a point from United, who are in fourth. Chelsea are level on points with the Gunners.
"We wait for the other teams and if they make mistakes. We do our work to win every game and on Saturday we did the job.
"In two weeks, we have another League game and we want to work hard. Our last away win [in the League] was at Bournemouth in November. It was important for us to win and also to win away.
"In the first half we played very well and had good control. We lost the control a bit but we defended very strong, we worked as a team.
"Everybody worked very hard and we were unlucky to concede the goal but overall it was a deserved win."