The 27-year-old Austrian stopper has been beaten by two goals from corners or free-kicks in both the losses at Portsmouth in the FA Cup a fortnight ago and in the league at Charlton Athletic a week later.
He told the Chronicle: “I don’t know exactly what has happened. We did a lot of training in set plays but we need to do some more and analyse what went wrong.
“Before the set play, we can avoid the stupid fouls then we don’t need to talk about set plays.
“We need to be more clever and not foul players when they have their back to our goal.”
Asked about Barnsley’s chances of survival after they fell seven points adrift of safety this week, Radlinger said: “I believe and so does everyone else. “That is the only way we can reach our goal.
“We have to keep fighting and know we can win games and the next one is at home against Sheffield Wednesday.
“We have had 100 per cent focus on this game and we know it is important and we have to win it.
“In almost every game in England, there is a good atmosphere but it should be very good in this derby.”
Asked what he thought of his own form, he said: “We don’t have to speak about my performance.
“We are one team. Sometimes one player has a bad day but the other one is better. We just have to stick together and keep fighting.”