Ole Gunnar Solskjaer admits he must have done something wrong for Manchester United to lose the Europa League final.
United went down on penalties after the match finished 1-1 after 120 minutes of play.
Solskjaer drew criticism for his late substitutions, and asked about the loss, he replied: "Now is not the time to point the finger at what I'd have done differently. But when you come out without the trophy you haven't done everything right.
"We're getting closer and closer and better. We were one kick away from a trophy and a good night.
"We have to have the desire to come back next year and improve. The only way to get the margins your side is to work harder and better."
He added: "It's quiet, a disappointed dressing room. That's football for you. Sometimes it's decided on one kick - and that's the difference between winning and losing.
"We have to learn from that one, not savour this feeling but taste this feeling and make sure we don't get it again.
"We didn't turn up. We didn't play as well as we know we can. We started alright and they got the goal, their only shot on target. We were disappointed to concede a goal on a set play.
"We pushed, we pressed, we got a goal. After we scored we didn't control the game or dominate as we wanted.
"They made it hard for us, they closed spaces. We had the majority of possession. They defended well. We didn't create enough big chances."
