Aston Villa boss Unai Emery praised Douglas Luiz after victory over Crystal Palace
Luiz kept his cool to score from the spot late on as Villa eventually overran Palace to win 3-1.
"We decided as well for Douglas Luiz to practice penalty kicks at the training ground. When there are matches like today with a penalty, he is feeling good and confident. We have other players as well who can take them," said Emery.
"The most important is to try to be responsible and mature, collectively and individually. The players who were on the bench, they have to be ready because we need the impact like today. The impact was amazing.
"We want to be competitive, we want to be strong in our mind trying to build a strong mentality, a winning mentality. Each match is very difficult but I want to face it and every competition being competitive and trying to be a contender in our own way this year.
"The Premier League is the most important and today was, of course, the result, but also some players and tactical decision I took today was a practice for us. For the 30 minutes we played Diaby on the left side, played Kamara as a midfielder and sometimes as a right centre-back in build-up.
"We were aware today that we wanted to win but we needed to use different tactical decisions. I was aware to give them confidence so they could take it."