However, the Bulgarian internatinal striker believes United have the perfect manager and players to respond to the recent setback.
"We are a strong team and we all support each other," he told MUTV.
"We know how to react after defeats.
"International breaks are sometimes difficult, because you have two games and you come back and can be a little bit tired and then you have a game immediately after that.
"But that's our job, there's no need to complain.
"Everything is possible. If you believe and have faith, and you really want it, it can happen.
"We need to believe in our quality and our ability.
"I think the gaffer will know the right encouragement to give us to prepare for the games we have.
"We will stay strong to the end."