That was not a novelty. Since he began coaching the team, Twain had been using this rewards-and-penalties training model to train his players to be competitive. Even if it was a training game, no one was willing to lose. That was why his team was able to persist to the end of a tough game and beat their opponents.
The players were excited when they heard that they were going to play in the games. Their behavior attracted Keane's attention. He paused in his training and stood on the sidelines to rest while he observed the other side of the field.
Manchester United also had such competitions, and he believed that Arsenal must have them too. He was not interested in the training itself. He was interested in the players' performances during training.
Twain assigned the players for each team aloud. The grouping was not divided according to the main force or substitutes but distributed randomly among the main force and substitutes.