Southampton boss Tonda Eckert spoke to BBC Radio Solent after his side's 1-1 draw at Birmingham City.
"I keep repeating, we play every game for three points but at the same time we know it is a tough place to come and not an easy place to play," he said.
"You know if you come here they have high energy, especially at the start, and you might need to go a little bit longer.
"We've been talking about for weeks that we need impact from the bench and we had that today. I'm very happy with the players who came on.