Having squandered a second half lead against Seattle on Saturday, Smith is looking for more commitment from his players for the mid-week clash.
Speaking to his team's official website, Smith said, "Within that period, we should have really finished the game off, but didn't. You're not going to be able to reach those heights for 90 minutes. It's impossible.
“The top sides in the world need a respite, and in that period they start to regroup and they manage a game and go again.
“We're no different. We threw a huge amount of effort into that first 45 minutes.
“The second period frittered away a little bit, but with a great start to the second half, that wasn't really our concern. We didn't need to force the issue, we needed to be professional and maintain that situation. [Saturday we were] not able to do that.
"Physically every week they're squeezing every bit of life out of themselves," Smith said of his squad.
"They're working as hard as they possibly can to win a game of football. I don't think we've been anywhere and tried to just maintain the situation.
“That takes a particular persona and group, and I think this group is capable of more.
“Even with the opportunities they had towards the end, we should still have won the game. We're in a position where we created enough to do that. We need to be more clinical in their box, and we need to be more frugal in ours. At the moment we're treading a very fine line."