Pennant, 20, said in the Mirror: "I've spoken to Ash over the last couple of days and he has said to me 'you'd better score'.
"But in all honesty, I'm just focused on the game.
"Playing Manchester United is very exciting for me. The lads have told me that the atmosphere during the game is something else and that you have to live it to believe it."
Probable Teams Today:
Leeds: Robinson, Kelly, Camara, Matteo, Olembe, Pennant, Johnson, Batty, Sakho, Smith, Viduka.
Man Utd: Howard, G Neville, Ferdinand, Silvestre, Fortune, Fletcher, Keane, P Neville, Giggs, Scholes, van Nistelrooy.
Kick-off: 1200 BST
Referee: Graham Poll (Tring)
TV: Highlights on ITV1, The Premiership from 10.30pm