Gerard Houllier refused to take credit for the double substitution which spared Aston Villa's blushes in the Carling Cup tie against Burnley.[LNB] Manager Houllier brought on Emile Heskey and Stewart Downing and both responded with a goal to earn his side a 2-1 success over the Clarets at Villa Park after extra-time.[LNB]Heskey looked to have won the tie in normal time before Clarke Carlisle's last gasp equaliser but then Downing's stunning strike sealed a last eight place.[LNB]Houllier said: "I don't take credit for the subs. The manager makes the decision to bring them on - but it's down to them.[LNB]"They scored the goals, I didn't. I wanted to rest some players but I knew at some stage, with other players tiring, they would make a difference.[LNB]"Emile made a difference and Stewart made a difference.[LNB]"The problem with the subs is they have got to be in the right frame of mind.[LNB]"If they have the right attitude, if the hunger is there, then they bring something.[LNB]"Their freshness can bring initiative which was the case. Emile came on and changed the game because he held the ball up."[LNB]Villa ended the game with 10 men after winger Marc Albrighton was red carded for a professional foul on Burnley sub Wade Elliott and he will be suspended for Sunday's derby with Birmingham.[LNB]Houllier said: "To me, Albrighton's sending off was a fair decision.[LNB]"He didn't touch him (Elliott) a lot but he touched him and the player used it as if he had been shot dead - but he touched him.[LNB]"From Marc's point of view, he should have reacted quicker. This is one of the main progresses we have to do.[LNB]"You need sometimes to have game awareness and next time he will understand that."