Northern Ireland boss Nigel Worthington is already focusing on Tuesday's qualifier against Estonia after the 1-0 defeat to Serbia at Windsor Park.
A Steven Davis mistake led to Serbia's goal and a result which leaves N Ireland fifth in Group C.
"I'm hugely disappointed for Steven as he's a fantastic professional but that's the game of football," he said.
"We now look forward to the Estonia game - it's about how quickly you get over it and bounce back."
Serbia controlled the first half but Northern Ireland improved after the break before a weak backpass from Davis let in Marko Pantelic for the only goal.
"I'm disappointed with the result and the manner in which we lost the game, with a short backpass," added Worthington.
"They had a lot of possession in the first half but we came out in the second half and played like we can play, which I was very pleased with.
"Serbia are a very good side, they are in the top 20 in the world rankings and we had trouble dealing with them in the opening 45 minutes.
"We tweaked one or two things at half-time, had a real go in the second half and I'm delighted for the players because they deserved that.
"We will do our best in our final three games - I have a fanstastic group of players and they give their all for Northern Ireland.
"Our results overall have been top class from my point of view."