"The result shouldn't mislead us," Berbatov said after the game.
"We still have problems, you just can't solve everything by scoring six goals in one game.
"The reality is that we don't have quality players for every position. You can't expect three horses to pull the carriage.
"I've always been an optimist but I don't see much light at the end of the tunnel in this moment. There's a lot of work to be done.
"A few days ago, I went to see a CSKA Sofia match and I nearly fell asleep."