Les Ferdinand says the team must adopt a cool professional attitude at Stamford Bridge tonight.
Glenn commented after Sunday's FA Cup defeat to Chelsea that the team were possibly a little too hyped-up for the game which led to them not playing their natural game.
Les tends to agree with that assessment and says it will not happen again.
"Maybe our emotions were running a bit too high on Sunday.
"No, it will not happen again. We've learned our lesson and we've got to go out there with a proper professional attitude, with an attitude to win the game.
"They had the hoodoo on us and we broke that. Unfortunately they beat us in the FA Cup, which has hurt everybody - without a shadow of a doubt it has hurt everybody.
"It is important that we focus and try and get three points on the night."
The 15-goal striker is fully prepared for a spot of Mickey-taking from the Stamford Bridge crowd, but says the boys will not be distracted from the job in hand.
"Of course they are going to give us a bit of stick because they beat us three days ago. But, like I said, we've got to be professional about it and go out there and give it our best."