Havertz said: "We prepared for the game very well, we didn't have our best game but we needed the three points and we have it now so we can be happy.
"We have to win every single game as City are always keeping the pressure on.
"It is so nice to be in the (title) race and every week you have to play at your best.
"When you do it, it feels even better. We have one game and we need the whole club behind us anything is possible."
Trossard also said: "Man Utd are still a good team and they can hurt you in different ways so credit to the boys - we defended really well.
"Obviously we only have one objective to win the league. We have done our job today and it will be up to the last game and that is what we are aiming for.
"Hopefully next week we can celebrate something, you never know it could be. We can only hope. We have done our job and that is the only thing we could have done."