Boss Dean Smith praised Jack Grealish but demanded more from Aston Villa following their 2-1 play-off semi-final comeback win over West Brom.
Conor Hourihane's rocket and Tammy Abraham's penalty turned the game around in the final 15 minutes to give Villa a narrow lead in their Sky Bet Championship play-off semi-final first leg.
Dwight Gayle opened the scoring but was sent off with two minutes left after collecting a second yellow card for diving in on Jed Steer.
Grealish set up Hourihane and won the spot-kick for Abraham to win it and Smith praised his skipper.
He said: "With the quality he's got he can create things. That's where we want him on the ball in the final third.
"Credit to West Brom in the first half, he had to beat four or five players with the numbers they had behind.
"By keeping our width in the second half, it gave us licence to go forward and get into places."
But Smith expects more from his side after they were forced to battle back from a goal down at Villa Park on Saturday.
He added: "I'm pleased we won the game but not pleased with the performance. We can certainly perform a lot better.
"Albion came with a game plan to sit behind the ball and slow the game down which they did very well and they capitalised on a mistake from us.
"Our movement and use of the ball we didn't do well enough in the first half.
"He is a goal threat but gives you so much more, he is going to be a big blow (on Tuesday)."
Shan admitted Albion must approach the home leg on the front foot if they are going to overturn the deficit and reach Wembley.
He added: "That's the approach we're going to have to have. Maybe tactically we have to have a different approach.
"We sat deeper today, the game plan worked for large parts but we were undone with a shot from distance and a penalty.
"It's simple communication, when the ball gets squared (for the first goal), to get people in the right slots. We're frustrated with that one and the momentum swings with them."
