Philadelphia Union lost 2-1 to Houston Dynamo in their first Eastern Conference semi-final clash but have vowed to fight back in the return leg.

The second-year club were beaten at PPL Park by goals from Andre Hainault and Calen Carr either side of Sebastien Le Toux's earlier equaliser but the players are well aware that the contest is not over with the second meeting to come at Robertson Stadium on Friday.

"We know that we have to beat them," said Le Toux. "So it's not like too much thinking about how we're defending or how we attack, how we have to keep the score.

"We know we can score goals. We know we have the will to score. We have the will to score and the want to score and we can use that especially in Houston where we have a good record there in the past."

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