Sir Alex Ferguson warns Wayne Rooney that he must convert more penalties for Manchester United Prior to Rooney's miss against Arsenal, Robin van Persie, Nani and Javier Hernandez had also missed from the spot for United this season, with only Ryan Giggs, who converted against Chelsea in the Capital One Cup, having a flawless penalty record for the club this term. The one thing about Rooney, though, is that it wouldn't matter if it was a World Cup final or a Rumbelows Cup first-round game against an amateur team, he would still want to score. And his temperament is that, if he misses, it won't affect him and that is important for a penalty-taker. That can be an issue with lots of players who take penalties. If they miss it, how they handle it can be a problem, but Wayne is good that way. He has the right temperament. His penalty the other night, even though he slipped, was well struck and it hit the target and that is important. If you hit the target, you are relying on the keeper to make a great save. If he does, full marks to him, but you have to give yourself the chance of making sure he has to make a great save. With Van Persie missing one and scoring one from the spot this season, Ferguson bemoaned the fact that Giggs was no longer guaranteed to be involved every week. "I think our best penalty taker is probably Giggs," Ferguson said. I can only ever remember him missing one, in an FA Cup penalty shoot-out against Southampton [in February 1992]. But Ryan doesn't play every week, so I would have to bring him on like in those American football games. Ferguson, who is waiting on the fitness of defender Jonny Evans ahead of Saturday's Premier League trip to Aston Villa, admits United's penalty issue has been compensated for by the number of players on the scoresheet this season. "We have 15 different goalscorers this season and it is definitely helping us," Ferguson said. The satisfying thing is the goals around the team. Fifteen different scorers is quite healthy, but we will take them from anyone. It doesn't matter who gets the goals as long as we get them.