United have won both A-League meetings so far this season, both victories coming at Skilled Park.

But Miron Bleiberg's men must travel to the Sydney Football Stadium this time and face a team which is rapidly forgetting what it's like to concede a goal.

Should Sydney manage to avoid shipping a goal for another 69 minutes then they will break the A-League record for the longest stretch without conceding.

"The second game I don't think we deserved to lose there because we were better in the first half," Keller told AAP.

"But now they come to our house so we'll see if they can perform like they did at their place.

"They're coming here to try to get us off the top position and we're going into that game with the intention of maintaining it, 100 percent."

The defender points to the fact that both of Sydney's main title rivals still have to come to the SFS - including Melbourne Victory on the final weekend of the regular season.

"If we can win that gives us a gap over them and then Melbourne comes to Sydney so we've got all the positive aspects of these last few rounds. They're all coming to us," he added.