Manchester United boss Alex Ferguson admitted that he is unsure about the penalty given to his side in the 2-0 win over Bolton, but believes the decision cancels out old dues. Rob Styles made a shocking decision when he penalized Jlloyd Samuel for bringing down Cristiano Ronaldo, who stepped up to score from the spot. However, it was obvious that the Bolton defender had gone for the ball without making much contact with Ronaldo. "I was surprised. It looked to me as though the player got a foot on the ball," Ferguson told Sky Sports. "But I think Rob has turned down four or five penalty kicks for us so he still owes us four. "It was a break for us and sometimes you need a break in these games." European champions United registered only their second win in five games this season, as they prepare to take on Denmark Aalborg in midweek.