“I’ll always say we are going to win the league. Because if you say you are going to be number two, you will be number two.
“I always set high goals and there is no changing that. But you saw last year just how close we were to the Treble and it was small details that ruined it.
“Last year, it was a decision in the Scottish Cup semi-final which was very important. But maybe we also had some luck with us in other games, like against Dundee United earlier. So it can happen both ways.
“It is so hard to win the Treble, but it is possible to do it because it has been done before.
“But for me now, we are just happy to improve as a team all the time and see where that leads us. We can win every game that we go into and that’s a good feeling. That’s in Europe, as well.”
Celtic face Hearts today knowing they need a win to keep on the trail of Aberdeen who face a tough trip to Inverness.
Deila has great respect for the Tynecastle outfit. He said: “They have improved a lot. When they got relegated, they started to play quite a young team. Then they got some more experience and won almost every game in the Championship.
“They took a lot of confidence from that and got the crowd on their side. They have a good energy in the club and that can take them even further.
“They have done a good job bringing in players that make them even better and have a style of play that can dominate games.
“You can see from their results so far this season that they are going to be at the top end of the table.”