Shane Long came off the bench hit both goals in Southampton's 2-0 win over Leicester City.
The 2-0 win keeps Saints within four points of leaders Chelsea and earned the praise of Leicester's former Real Madrid and Inter Milan midfielder Esteban Cambiasso.
"I don't watch who is behind," Koeman said after overseeing a fifth straight win in all competitions.
"We have our focus on the way we play and that was important because that makes you keep winning games, bringing points, if you keep that.
"We don't have players to play the long ball sometimes if there is good pressing of the opponent. We need movement.
"Cambiasso said to me 'what a good team you have' and that is a great compliment from a great player and that's important."
